I think the #1 cause is drugs, not marijuana, I mean meth, crack/cocaine, herion, and all the other nasty crap. That has caused nothing but problems for everyone. Every person in ths country is affected by the drug problems, in some way. think if we could completely elimate the drug problem the world would be a much better place. Also Ive noticed in the past few years tat prescription drugs have been causing lots of problems with teenagers. Im sure thats not the only cause but its probaly #1, or at least in the top 3.