One of the trickiest things about raising a teenager is balancing their natural desire for independence with your instinctive need to look after them. That struggle is keenly felt by parents when confronting the issue of drugs and alcohol. As your teen grows up and their world expands, they will be exposed to environments and situations that require smart decision making. Accepting that you can't be there to guide them can be challenging, and you might feel confused about the best course of action. So we got some practical tips from parents who have been through it before.