Intentions of smokers to use free nicotine replacement therapy

Methods

The study, conducted across Canada, enrolled daily smokers aged 18 years or older who had smoked at least 10 cigarettes per day at some point in their lives (a level judged to define an established smoker).6 Of 15 958 households contacted by random digit dialing, we estimated that 1372 contained at least one adult daily smoker. We interviewed 889 people (a response rate of 64.8%) and found that 825 had smoked 10 or more cigarettes per day, meeting our inclusion criteria for analysis. Sample sizes are reported as unweighted values. Results of statistical tests, means and proportions are reported based on weighted data. We obtained ethics approval for this study from the ethics review committee of the Centre for Addiction and Mental Health.

We asked the participants if they would be interested in nicotine replacement therapy if it was offered free of charge. To further explore smokers' level of interest, we asked the interested respondents for what purpose they would use nicotine replacement therapy (e.g., to quit for good, to stop temporarily or for help in places where smoking is not permitted), for how long they would be willing to use it to stay off cigarettes and how soon they would use it if it was sent to their homes.

Results

Demographic and smoking characteristics of the respondents are presented in Table 1. More than half (58.9%, weighted [480/825]) said they would be interested in nicotine replacement therapy if it were offered for free. Interest was not significantly related to demographic characteristics, but those interested in nicotine replacement therapy smoked more heavily than those not interested. Almost all of those interested (93.8%, weighted [447/480]) said that they would use the nicotine replacement therapy to help them quit for good. Of those who would use it to quit, most (80.6%, weighted [358/447]) said they would use it as long as needed to stay off cigarettes. Furthermore, of those interested and intending to use nicotine replacement therapy to quit, 61.1% (weighted [275/447]) said they would use it within a week if it was sent to their homes, implying a concrete commitment to receiving it. Finally, we found that prior use of nicotine replacement therapy was predictive of future interest: smokers who had used it in the past were more interested in receiving free nicotine replacement therapy than were those who had never used it (74.5% v. 44.6%; p < 0.001). In addition, smokers who said they intended to quit smoking were more likely to say they would be interested in nicotine replacement therapy (67.3%) than those intending to reduce (57.8%) or to maintain their smoking (42.4%) (p < 0.001).

Interpretation

Our findings suggest that a substantial population of smokers would be willing to participate in public health initiatives to reduce the prevalence of smoking through the distribution of free nicotine replacement therapy. Furthermore, our results provide new information regarding what recipients would do with nicotine replacement therapy: many of the respondents in our survey said they would use it to quit smoking, continue to use it for as long as needed to quit smoking and begin use soon after receiving it. These responses provide confidence about the utility of mass distribution of nicotine replacement therapy.

As we expected, participants who intended to quit smoking were more interested in nicotine replacement therapy than those who intended to reduce or maintain their smoking. However, it is unclear why 42% of the respondents who intended to continue smoking the same amount said they would be interested in free nicotine replacement therapy. This finding perhaps reflected an eventual but not immediate intention to quit. Also interesting was our finding that prior use of nicotine replacement therapy predicted future interest in using it again, which could indicate 1 of 3 factors. First, prior users of nicotine replacement therapy are more positive about using it because they found it helpful in a past attempt to quit. Second, prior users may have a better knowledge of the expense associated with nicotine replacement therapy and thus be more appreciative of the opportunity to receive it free of charge. Finally, both past use and future interest could be driven by the respondents' general attitudes toward nicotine replacement therapy, such as whether it is helpful or dangerous.

The primary limitation of our study is that self-reports of intended behaviours do not always predict what people will actually do. Further research is needed to explore whether smokers who say they are interested in receiving free nicotine replacement therapy will actually consent to receiving it and use it to attempt to quit smoking.

This research has important policy implications. Our findings suggest that a substantial proportion of smokers are interested in nicotine replacement therapy and would agree to receive it free of charge as part of a public health initiative to reduce the prevalence of smoking. In addition, even smokers who have used nicotine replacement therapy in the past will most likely be receptive to recommendations by health professionals to use it as a way to successfully quit smoking.

@@ See related research paper by Eisenberg and colleagues, page 135, and related commentary by Ebbert and Hays, page 123