You can't second hand smoke crack, that's not really how it works at all. As for heroin, you can't just arrest people for shooting up in public and hope that's

You can't second hand smoke crack, that's not really how it works at all. As for heroin, you can't just arrest people for shooting up in public and hope that's going to stop the problem. The kinds of people who shoot up or light up a pipe in public are at such a low point in their life that the disincentive of arrest (and fines/jail) means literally nothing to them. They're also often homeless. Where exactly do you expect the homeless junkies to shoot up? People doing hard drugs in public isn't like someone smoking a joint while walking down the street or even like someone drinking a 40 oz in public. Instead, the better option is to take a pragmatic approach. In my city, in areas of high drug use, they have put needle disposal bins in the public toilets and other places people shoot up. Surprisingly, they actually do get used and have significantly reduced the number of used needles on the street.