Earlier quoted context omitted.
Wow, that's a lot of downvotes and only one counter-point. What sorts of recreational drugs are not addictive? And what sorts of drugs will not mess you up when taken in "recreational" dosages?
Pot, LSD, and mushrooms, for starters. Except for expansive and distorted definitions of the word "addictive", and except for that one friend everyone seems to have who couldn't handle their acid.
Do you characterize people with other drug sensitivities as "unable to handle their [Advil/Codeine/Penicillin/Accutane/etc]" ?
A drug makes 1% or 0.1% of its users go insane can still reasonably be characterized as very dangerous.