I guess the best response would be, "Would you care to make a wager?" Let them put their money where their mouth is and see if they're still as confident about their stance.
However, in this situation I believe it could be argued that any psychedelic can be "bad for you" mentally if not physically. Most well adjusted people will have a good time on the stuff, most the time, but people suffering from depression, schizophrenia or bipolar disorder can be sent into a longer psychotic episode than just the 4 to 6 hours they bargained for.
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