How common is drug and alcohol addiction in teenagers?

Very common. It is the fastest raising population of abusers. Unfortunately, very common. About 50% of my patients are teenagers. The parents often have no idea. The biggest problem is that teenagers feel, which is unfortunately age-appropriate, that nothing bad will happen to them. Seeing their pears in troubles or even dying does not help. Find a psychiatrist who worked with teenagers, not just with addictio.