This list is unsorted so far - not sure which way to sort it. Alphabetically, by popularity, or by most prevalent drug use throughout.
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Expanding upon Chibiyusa's excellent 'Let's get Stoned!' list, this movie list highlights all movies where stronger illegal narcotics take either a central role, or affects (positively or negatively) a key character's life.
One observation I made is vast majority of drug movies, excluding the all-in-its-own-category Marijuana, revolves around cocaine, heroin and ecstasy. Most others take a a back seat or secondary role (crack cocaine for example is very much ignored). And only one movie deals (briefly) with Ketamine. I've also included a few movies that revolved around fictional illegal narcotics.
See, these lists have educational purposes too. :)
Minority Report: That crazy looking asthma pump thing, I'll let you do the reseach!
Panic in Needle Park: heroin
Atleast Heroin and Ecstasy
http://www.listal.com/movie/mina-olin-siin-esimene-arest
Meth