Whats wrong with drugs? I think if people like spending their time however they want without hurting anyone it's all right. Fuck if someone wanna smoke some meth in their own fucking home let them be.
If the substances don't make them paranoid or more likely to hurt others, then I agree.
But I can't think of any drugs (including alcohol) that don't increase the risk of people being hurt. Not to mention the addictions that develop that force people to need to find the money to pay for drugs, that ultimately they may not be able to get without doing something to others (like robbing or stealing), which is then a problem.