Varenicline for Smoking Reduction in Veterans Unwilling to Quit

Evidence-based smoking cessation treatments can double smoking abstinence rates, yet these treatments are underused by the millions of Veterans who smoke. One reason for this is that the great majority of people who smoke are not ready to make a quit attempt when cessation treatment is offered (70-90%). An important public health goal is to increase engagement of people not ready to quit smoking in highly effective treatment that prepares them to make quit attempts and ultimately achieve abstinence (i.e., Motivation-phase treatment; MPT). MPT typically combines smoking reduction counseling with nicotine replacement therapy (NRT). Although offering NRT Motivation-phase treatment (NRT MPT) in healthcare settings increases the reach of tobacco treatment, such interventions only weakly affect long-term abstinence. It is vital that the investigators develop more effective MPTs that increase quit attempts and quitting success in people not ready to quit. Varenicline, the most effective single agent smoking cessation pharmacotherapy, holds great promise as an intervention for people who are not ready to make a quit attempt. The investigators propose that MPT will be markedly more effective if it involves the use of varenicline (vs. NRT) because it will more effectively reduce smoking reward, affective withdrawal, and tonic craving. Initial evidence suggests that varenicline increases quitting motivation in those not ready to quit, but the extant studies have not 1) directly evaluated varenicline effectiveness in this population and 2) compared varenicline MPT with NRT MPT, the current standard treatment for those not ready to make a quit attempt. The goal of this study is to evaluate whether varenicline MPT is especially effective and cost-effective relative to NRT MPT, in Veterans who are willing to reduce but not quit smoking. This study will compare the use of varenicline MPT vs. NRT MPT on: biochemically verified point-prevalence abstinence at 1 year (primary outcome), quit attempts, and cessation treatment use.

This study is a 2-group randomized controlled trial that will enroll 400 adults from three geographically diverse VA hospitals who smoke 5 cigarettes/day and do not want to quit smoking in the next 30 days but are willing to cut down. Participants will be randomized to one of two 12-week MPT groups: (1) varenicline, or (2) NRT (2 milligrams (mg) mini-lozenges). All participants will receive 5 phone counseling sessions focused on smoking reduction during the 12-week MPT. Any participants who decide to try quitting will receive smoking cessation treatment involving continued use of their assigned study medication and cessation counseling.