I am remembering a snippet of a story where a teen talks "his" parents into giving "him" alcohol to train "his" body to rejecting it. The teen has some sort of mind/body power. When "he" got rid of the alcohol in his system he coughed/sneezed and it came out as a vapor. The parents were there with a breathalyzer and to monitor "dosage". The teen also was able to do it with an otc sleep aid. The teen convinced the parent by saying "what if somebody slipped me something?"
Unfortunately that is all I can remember. When I started thinking about this I was thinking "she" but that switched to "he" so saying he earlier may be incorrect.
Thanks, limab