Adult smokers ( N = @ ) enrolled in a @-week , double-blinded , placebo-controlled trial of @mg naltrexone for smoking cessation were categorized into subgroups based upon past @-month drinking patterns : HDS ( n = @ ; i.e. , averaged @ heavy drinking episodes per month ) , moderate-to-light drinking smokers ( n = @ , i.e. , consumed @ drink up to a maximum of < @ heavy drinking episodes per month on average ) , or nondrinking smokers ( n = @ , no alcohol consumed in the past @months ) .