In the mind of a young person, the risk of using drugs has many dimensions. Not only do teens consider physical risk, but also emotional (acting inappropriately, or getting depressed), social/relational, and aspirational. Physical risks include addiction, while social risks include disappointing friends or family, and losing friends. Aspirational risks include losing a job or getting in trouble with the law.
All these perceived risks -physical, emotional, social, and aspirational - are different with each drug, and contributing factors include things like anti-drug campaigns and parental involvement, including discussions about the risks of drug use.
Teens show remarkable resilience to the troubles of addiction, and when given professional and appropriate assistance, respond with great changes in behaviors and attitudes. Growing up is hard, teens are vulnerable, and sometimes they need a little help. Once an addiction presents there is little point in willing it away, and substance abuse problems very rarely get better on their own.
Teens respond far better to treatment when they get it early, waiting for too long before taking action only entrenches addiction, and increases the difficulties of treatment.
Teen substance abusers can get better; they want to lead a great life and hunger to fill all the promise of their potential. Don't let an early addiction derail their lives, get them help, and get them better... they'll thank you for it.