Use of nicotine replacement therapy and stop-smoking medicines in a national sample of Aboriginal and Torres Strait Islander smokers and ex-smokers

In 2012–2013, 44% of Aboriginal and Torres Strait Islander adults smoked, 2.5 times the age-standardised prevalence among other Australian adults, and 26% were ex-smokers.1 Although the proportion of those who had ever smoked and had successfully quit was only 37%, compared with 63% of other Australians, this had increased from 24% in 2002.1,2 Several types of nicotine replacement therapy (NRT; gum, patches, lozenges, sublingual tablets and inhalers) and two prescription-only stop-smoking medicines (SSMs; bupropion and varenicline) are available in Australia to assist cessation.3 All have been shown to increase the chance of successfully quitting, with varenicline and combinations of NRT being the most effective.4

Nicotine gum became available in Australia in the 1980s, followed by patches in the 1990s and other forms of NRT in the past decade.3 Over-the-counter availability of NRT occurred first in pharmacies, then supermarkets. Subsidised availability by prescription for patches followed listing with the Pharmaceutical Benefits Scheme (PBS) for veterans from 1994, Aboriginal and Torres Strait Islander people from 2009, and all others from 2011. Bupropion was listed on the PBS in 2001, and varenicline in 2008.3 Since 1999, Aboriginal health services in remote areas have been able to dispense these PBS items at no cost through Section 100 of the National Health Act 1953.5 In addition, since July 2010, many non-remote Aboriginal health services and general practices participating in the Indigenous Health Incentive of the Practice Incentives Program have been able to reduce or eliminate the copayment for all PBS medicines, including SSMs, for their Aboriginal and Torres Strait Islander patients.6

Clinical guidelines suggest that NRT, bupropion or varenicline be recommended to all dependent smokers who are interested in quitting.7-9 Here, we explore the use of these medicines and beliefs about them among a national sample of Aboriginal and Torres Strait Islander smokers and ex-smokers. We also explore variation in their use among dependent smokers in this population, and make comparisons with smokers in the general Australian population.

Methods

The Talking About The Smokes (TATS) project surveyed 1643 Aboriginal and Torres Strait Islander smokers and 78 recent ex-smokers (who had quit ≤ 12 months before), using a quota sampling design based on the communities served by 34 Aboriginal community-controlled health services (ACCHSs) and one community in the Torres Strait. It has been described in detail elsewhere.10,11 Briefly, the 35 sites were selected based on the distribution of the Aboriginal and Torres Strait Islander population by state or territory and remoteness. In 30 sites, we aimed to interview 50 smokers or recent ex-smokers and 25 non-smokers, with equal numbers of women and men, and those aged 18–34 and ≥ 35 years. In four large city sites and the Torres Strait community, the sample sizes were doubled. People were excluded if they were aged under 18 years, not usual residents of the area, staff of the ACCHS or deemed unable to complete the survey. In each site, different locally determined methods were used to collect a representative, although not random, sample.

Baseline data were collected from April 2012 to October 2013. Interviews were conducted face to face by trained interviewers, almost all of whom were members of the local Aboriginal and Torres Strait Islander community. The survey was completed on a computer tablet and took 30–60 minutes. A single survey of health service activities was also completed at each site. The baseline sample closely matched the distribution of age, sex, jurisdiction, remoteness, quit attempts in the past year and number of daily cigarettes smoked reported in the 2008 National Aboriginal and Torres Strait Islander Social Survey (NATSISS). However, there were inconsistent differences in some socioeconomic indicators: our sample had higher proportions of unemployed people, but also higher proportions who had completed Year 12 and who lived in more advantaged areas.10

The TATS project is part of the International Tobacco Control Policy Evaluation Project (ITC Project) collaboration. Interview questions were closely based on those in ITC Project surveys, especially the Australian surveys.12 We asked all smokers and recent ex-smokers whether they had ever used NRT or SSMs, and which they had used. For those who had used NRT, we asked if they were currently using it, when and for how long they last used it, where they got it and if it was free, and whether they would use it again in the future. We asked similar questions of those who had used SSMs. We asked all smokers and recent ex-smokers whether they thought NRT and SSMs help smokers to quit, and about their quit attempts and sociodemographic factors. The questions are described in detail in Appendix 1.

We used the Heaviness of Smoking Index (HSI) to assess dependence among daily smokers. The HSI was coded 0 to 6 based on the sum of the responses to two questions: cigarettes per day (CPD) and time to first cigarette (TTFC). These items were each coded as 0 (0–10 CPD; TTFC, ≥ 61 min), 1 (11–20 CPD; TTFC, 31–60 min), 2 (21–30 CPD; TTFC, 6–30 min) or 3 (≥ 31 CPD; TTFC, ≤ 5 min).13 We categorised HSI as low (0–1), moderate (2–3) or high (4–6).14,15 We also assessed the three criteria for dependence in the Royal Australian College of General Practitioners (RACGP) cessation guidelines: TTFC ≤ 30 min, > 10 CPD, and withdrawal symptoms on previous quit attempts (defined in our sample as strong cravings during the most recent quit attempt).7

TATS project results were compared with those of 1017 daily smokers surveyed in Wave 8 of the Australian ITC Project between July 2010 and May 2011. The ITC Project survey was completed by random digit telephone dialling or on the internet, and included smokers contacted for the first time and those who were recontacted after completing surveys in previous waves. For respondents who had completed surveys in previous waves, the ITC Project questions about use of NRT or SSMs were different to the TATS project questions, so for these comparisons we included only the 189 daily smokers who were newly recruited to the ITC Project.

The project was approved by three Aboriginal human research ethics committees (HRECs) and two HRECs with Aboriginal subcommittees: Aboriginal Health & Medical Research Council Ethics Committee, Sydney; Aboriginal Health Research Ethics Committee, Adelaide; Central Australian HREC, Alice Springs; HREC for the Northern Territory Department of Health and Menzies School of Health Research, Darwin; and the Western Australian Aboriginal Health Ethics Committee, Perth.

Statistical analyses

We calculated the percentages and frequencies of responses to the TATS project questions, but did not include confidence intervals for these as it is not considered statistically acceptable to estimate sampling error in non-probabilistic samples. We compared results for daily smokers with those from the Australian ITC Project, which were directly standardised to the distribution of age and sex of Aboriginal and Torres Strait Islander smokers reported in the 2008 NATSISS.

Within the TATS project sample, we assessed the association between variables using logistic regression, with confidence intervals adjusted for the sampling design, using the 35 sites as clusters and the age–sex quotas as strata in Stata 13 (StataCorp) survey [SVY] commands).16 P values were calculated for each variable using adjusted Wald tests. However, we used χ2 tests to assess the association of variables with beliefs about whether NRT and SSMs help in quitting, and the association of past use with reasons for not intending to use them in the future. Median durations of NRT use are reported with interquartile ranges (IQRs) and were compared using the non-parametric equality of medians test.

Reported percentages and frequencies exclude those refusing to answer or answering “don't know”, except for questions on future interest in NRT or SSM use and whether they help in quitting, which include those answering “don't know”. Less than 2% of smokers and recent ex-smokers answered “don't know” or refused to answer each of the questions analysed here.

Results

Compared with other daily Australian smokers in the ITC Project, lower proportions of Aboriginal and Torres Strait Islander daily smokers reported ever using any NRT or SSMs (37% [515/1379] v 58.5% [95% CI, 42.8%–72.6%]) and having used them in the past year (23% [318/1369] v 42.1% [95% CI, 29.4%–56.0%]).

Among all Aboriginal and Torres Strait Islander smokers and recent ex-smokers in the TATS project sample, 29% (501/1700) had ever used NRT and 11% (193/1700) had used SSMs. Nicotine patches were the most commonly used, by 24% (415/1699), followed by varenicline (11%; 183/1699), nicotine gum (10%; 174/1699), lozenges (3%; 50/1699), and inhalers (3%; 50/1699). Only 1% (17/1699) had used bupropion.

Of the Aboriginal and Torres Strait Islander smokers and recent ex-smokers who had used NRT within the past year, most had last got it from an Aboriginal medical service (46%; 99/216), pharmacy (31%; 66/216) or another local health service (15%; 32/216), with only 3% (6/216) getting it from an ordinary store. Three-quarters (74%; 161/217) got their NRT at no cost, including almost all who got it from an Aboriginal medical service (93%; 92/99) or another local health service (91%; 29/32).

Of the Aboriginal and Torres Strait Islander smokers and recent ex-smokers who had used NRT within the past year but were currently not using it, only 9% (16/174) had used it for the recommended period of more than 2 months;7-9 49% (85/174) used it for a week or less and 79% (138/174) for a month or less. The median duration of NRT use was 14 days (IQR, 3–30 days), with no significant differences by HSI score or whether it was free.

Aboriginal and Torres Strait Islander daily smokers who were more dependent, according to the HSI and RACGP criteria, were more likely to have ever used NRT or SSMs than those who were less dependent (Box 1). Fewer non-daily smokers than daily smokers or recent ex-smokers had ever used them. These associations were similar but less marked for use in the past year.

Among Aboriginal and Torres Strait Islander smokers who were at least moderately dependant (HSI score ≥ 2), the group for whom NRT and SSMs are recommended, those who were socioeconomically advantaged were more likely than the disadvantaged to have ever used NRT or SSMs and to have used them in the past year (Box 2). Use decreased with increasing remoteness and area-level disadvantage, increased with education, and was lower among those who reported being treated unfairly in the past year because they were Indigenous. Use also increased with age and was higher among smokers whose local health service had dedicated tobacco control resources. Those who were socioeconomically disadvantaged were even less likely to use SSMs than NRT (Appendix 2).

Most Aboriginal and Torres Strait Islander daily smokers said NRT and SSMs help smokers to quit: 70% said they help “very much” or “somewhat”, 16% said “not at all” and 14% did not know (Box 3). Similarly, the Australian ITC Project reported that 74.2% (95% CI, 68.9%–78.9%) of Australian daily smokers agreed that NRT and SSMs would make it easier to quit, 11.0% (95% CI, 8.7%–13.8%) disagreed, and 14.8% (95% CI, 10.8%–20.0%) neither agreed nor disagreed or did not know.

Having used NRT or SSMs was strongly associated with Aboriginal and Torres Strait Islander smokers believing that they help in quitting. Heavy smokers were more likely to believe that they would not help at all (Box 3).

Dependent Aboriginal and Torres Strait Islander smokers who believed NRT and SSMs would help in quitting and those who had used them (ever or in the past year) were more likely to be interested in using them in the future (Box 4). Frequency of strong urges to smoke and strong cravings on the most recent quit attempt were not associated with interest in future use of NRT and SSMs (data not shown).

The main reasons given by dependent smokers who were not interested in using NRT and SSMs in future were that they were not ready to quit (NRT, 36% [162/445]; SSMs, 29% [131/449]), because of side effects (19% [85/445]; 25% [114/449]), they did not think they would work (18% [81/445]; 16% [73/449]) and they preferred not to use them (16% [73/445]; 18% [82/449]). Cost was rarely mentioned as a reason (3% [15/445]; 2% [10/449]). There were significant differences between the reasons given by those who had and had not used NRT or SSMs in the past year (P < 0.001). Those who had used NRT were more likely than those who had not to say they would not use it in the future because of side effects (45% [26/58] v 15% [59/386]) and were less likely to report not being ready to quit (12% [7/58] v 40% [155/386]).

Discussion

We found lower use of NRT and SSMs among daily smokers in a large nationally representative Aboriginal and Torres Strait Islander sample than among those in the general Australian population. This is consistent with research in various countries that has found that smokers from more disadvantaged groups are less likely to use these medicines.17,18 We also found a social gradient of reducing use with increasing disadvantage (including perceived experiences of racism) within the Aboriginal and Torres Strait Islander community. Consistent with previous research, we found this gradient was steeper for the use of varenicline (bupropion accounted for very little of the SSM use) than for NRT.18,19

In recent years, many ACCHSs and their government funders have increased their focus on, and directed significant resources towards, tobacco control and cessation support. Our finding of greater use of SSMs by smokers whose local ACCHS had dedicated tobacco control resources provides some evidence for the effect of these policy decisions. We explore other non-pharmacological cessation support elsewhere in this supplement.20

Early research into Aboriginal and Torres Strait Islander smokers' use of SSMs focused on the disincentive of the cost of NRT, and interventions to subsidise or provide free NRT.21-24 Covering the costs of treatment has been demonstrated to increase the use of NRT and bupropion in other contexts.25,26 Following policy changes, we found that nearly three-quarters of participants had got their most recent NRT at no cost, removing this financial impediment to its use. Unlike earlier research, cost was rarely given as a reason in our survey for not intending to use NRT or SSMs in the future.21,23 While some smokers are still paying a proportion of the cost, it is reassuring that policies to provide access to free NRT seem to be effectively reaching many Aboriginal and Torres Strait Islander smokers.

It is encouraging that a similar proportion of Aboriginal and Torres Strait Islander daily smokers as those in the broader Australian population think these medicines assist cessation. Further, Aboriginal and Torres Strait Islander smokers who were more dependent were more likely than the less dependent to have used them, in accordance with current clinical guidelines. However, there is still opportunity to improve their use. The clinical guidelines can be better promoted during the training and ongoing education of clinicians and tobacco control workers, to enable more frequent discussion about them with smokers. There remains a large proportion of Aboriginal and Torres Strait Islander smokers who have never used these medicines, are less likely to think they help and less likely to use them in the future, who could be informed about their effectiveness in assisting quitting.27

The frequent use of NRT for much less than the recommended 8 weeks is similar to earlier reports in this population; likewise, the median duration was similar to those found in other research in Australia and elsewhere, particularly the shorter durations reported when NRT is available over the counter rather than by prescription.22,28-31 Research into the common reasons for stopping NRT and SSMs (resuming smoking, side effects and the belief that it has already worked) suggests that these are generally legitimate and may not be cause for great concern. For example, data from other ITC Project surveys show that 66% of those who stopped early because they believed that they no longer needed the medication were still abstinent at 6 months.30

There has been a significant increase in the use of SSMs in Australia in recent years, especially associated with the release of varenicline in 2008.32 The release of new varieties of NRT and other SSMs has also been shown to be associated with this increase in the total use of SSMs, often with very little compensatory decline in the use of older medicines.19,26,32 We found that a variety of types of NRT were used (most commonly patches), as well as varenicline and a small amount of bupropion. The range of NRT formulations and other medicines is likely to increase in the future.3 The potential impact of e-cigarettes as an aid to cessation remains unclear and contested.33,34

Strengths and limitations

The main strength of our study is its large national sample of Aboriginal and Torres Strait Islander smokers, providing the first detailed national information about the use of NRT and SSMs in this population. However, it is a non-random, albeit broadly representative, sample, and caution is needed in interpreting the comparisons with the Australian ITC Project sample and in generalising the results to the whole Aboriginal and Torres Strait Islander population. The use of NRT or SSMs in our sample of Aboriginal and Torres Strait Islander people in communities served by ACCHSs may be different to that in communities without access to an ACCHS, who use private general practices. Our self-reported data are probably limited by incomplete recall of past use of NRT and SSMs and quit attempts. The effect of these biases will be to weaken reported associations, leading to greater confidence in the significant associations but requiring caution in the implications of findings of no association.