There is definitely opposition. It's mostly on religious grounds, a la "My beliefs dictate that I should prevent you from 'playing god', because that privelege is reserved for my deit(y|ies).".
Don't forget alcohol! Watching people climb up on a pedestal and try and tell me that alcohol is somehow not a drug makes my blood boil every damn time I hear it. I think it's hard to correct these people's thinking because our society drills the very phrase "drugs AND alcohol" into children's brains from a very early age including in the DARE programs in our schools. Somehow everyone is okay with casual abuse of alcohol because they don't think of it as a drug. "What else can you take into your body that fucks you up like alcohol does, but is not a drug?" is the retort I've been using in recent years.
There is definitely opposition. It's mostly on religious grounds, a la "My beliefs dictate that I should prevent you from 'playing god', because that privelege is reserved for my deit(y|ies).".