This study examined 449 U.S. Navy recruits who reported that they were current smokers upon entering Navy recruit training. Recruits were prohibited from using tobacco for the duration of the 8 weeks of basic training. Participants completed tobacco surveys at entry into the Navy, upon graduation from recruit training, and after 1 year of service. Forty percent of the smokers at entry into the Navy changed their classification to former smokers at the end of recruit training. At the 1-year follow-up, 19% of the initial smokers classified themselves as former smokers. Multivariate logistic regression analyses indicated that having a higher intent to quit was predictive of reporting oneself as a former smoker at recruit training graduation. Smoking fewer cigarettes per day at entry into the Navy and more years of regular tobacco use were predictive of reporting oneself as a former smoker at the 1-year follow-up. Findings from this study suggested a meaningful impact of the Navy's no-smoking policy during recruit training in reducing smoking prevalence.