Apart from being immediately suspicious of how many 10/10s this got, the film is a shocker of a frankly laughable and bizarre Reefer Madness type hard sell. I wonder is there "peer advisor" or whoever provided the drug use practices reseach information was having a cruel joke on the production.
Having seen the odd drug user in my time: i can tell you this is just plain wrong in what it portrays as (for one) injecting behaviour. Its like they picked up all the myths, since debunked, about injecting drugs and decided they were real enough for this movie. But then most people who see this film will be the just say no brigade, so I guess as long as it paints injection opioids as a one way trip to hell, that justifies liberties with the truth.
A lie is a lie, but I give this 2/10 for the fact that it deals with an important topic, however badly.
Go see Drugstore Cowboy or, if you prefer the newer or more dramatic, see Souvenirs. Better still, find Pure S***...