While we are talking about the uses of psychedelic drugs, it is appropriate to discuss their dangers. The psychedelic voyage does produce some casualties; the question is how many and how serious they are, what causes them, and how to prevent them. This has been a matter of controversy since the 1960s. Drug users sometimes would not confess that they had any problems, because doubts and regrets were supposed to be a sign of rigidity or repression or some other inadmissible personal problem. Anti-drug crusaders sometimes would not admit that there was such a thing as a good trip or an insight to be derived from psychedelic drugs.