Abstract
Over a six month period, 19,948 new military inductees were confidentially surveyed about their previous illicit usage of fourteen substances. Of these men, 6,203 (32%) indicated usage, at least once, of one or more of the fourteen substances. Of the 6,203 users, sixteen percent reported that they had experienced an unpleasant effect from their drug use upon one or more occasions. The substance most often mentioned as causing unpleasant effects was LSD, followed at some distance, in second and third place, by heroin and STP.The average number of other drugs used by those reporting unpleasant effects varied from 7.6 in the heroin users to 1.4 in the marihuana users.

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