Everyone does stupid sh!t on drugs, that's what they're for. I'd be more suspicious of anyone in this day and age that claimed they had never touched drugs.

http://www.huffingtonpost.com/2008/07/01/study-shrooms-help-some-s_n_110182.html

I can't remember where I first read this, could've been here for all I know, thought it was interesting.
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"Gentlemen, you can't fight in here, this is the War Room!"
President Merkin Muffley