If you have a tween, start talking to them now. Just because they are good students and good listeners, doesn't mean they do not have the potential for becoming "thrill-seekers" later on in life!
Talk to them about the dangers of peer pressure and
taking un-necessary risks. Talk to them about not doing drugs before
someone else has the same conversation (with the opposite advice!)
This article in Time.com explains why the teen brain is drawn to risk.