I have read (from sources of dubious provenance) that narcotics addicts who have done multiple rounds of rehab and relapse were able to finally kick their habits by taking high doses of entheogen drugs, such as LSD, psilocybin, and ibogaine.

Suggest someone attend substance abusers' anonymous meetings for the rest of their lives, and no one bats an eye. Suggest that someone kick their drug habit by taking another drug, just once, and people lose their freakin' minds.