Ss without previous experience with marijuana smoked marijuana or placebo cigarettes in the presence of a model who exhibited marijuana- intoxicated behavior or did not. Marijuana naïveSs' self-ratings of intoxication were differentially affected by drugs and placebo, but were not affected by modeling. Performance on four of six cognitive measures was impaired by drug consumption. On one additional task, performance was impaired by modeling in conjunction with consumption of the active drug. In order to clarify the nature of the relationship between previous experience with marijuana and self-ratings of intoxication, a number of aposteriori analyses were carried out which compared performance, symptoms, and ratings of marijuana naïve and experiencedSs. The results indicate that previous experience is a socialization process through which individuals learn to discriminate and label the drug state as intoxication.