Clearly you know very little about Vancouver's East side. They have actually had fairly good success with keeping an eye on the heroin users by creating safe injection sites with proper places to dispose of old needles and collect new needles. I guess the residents of the east side got tired of their children stepping on/playing with used needles in the street and decided to try a different, less oppressive approach. Face it, drug users will use, but at least this way we have some measure of control over the waste, addicts and crime that occurs in tandem with drug use.
Don't be silly, clearly the way to battle drug use is to make it a massive crime that yeailds such hard penalties that people are willing to have shootouts with cops rather than be caught, and to air commercials that pretty much make everyone want to use the drug after they stop laughing.
If that doesn't work, defoliating the country that makes the drugs should offer a good solution to your people using them.
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