Pavlovian conditioning as a risk factor of heroin 'overdose' death - addicts who take the same dose in unfamiliar circumstances have lower tolerance User TwentySneventyTwelve, in the Reddit Science subreddit, 04 Oct 2016
TIL that heroine addicts can overdose on their "usual dose" if ingested in a strange environment. User thatsnotirrelephant, in the Today I Learned (TIL) subreddit, 03 Feb 2016