This study examined the impact of an educational intervention on knowl
edge, attitudes, and smoking prevalence among Navy recruits. Seven com
panies (496 recruits) were randomly assigned to treatment groups. Grou
p 1 received a no-smoking policy only; Group 2 received a no-smoking p
olicy and educational intervention; Group 3 received a no-smoking poli
cy, educational intervention, and booster training; and Group 4 receiv
ed a no-smoking policy and sham treatment. The educational interventio
n was effective in reducing smoking prevalence. Policy alone did not s
ignificantly reduce smoking prevalence among Navy recruits.