Don't be afraid to try different things, just be careful. Don't display your stupidity. On the same note, stay away from dangerous or angry people. You don't want to get caught in the midst of someone's temper tantrum or the crossfire of an argument. Make sure that the things that you are putting in your body are the right things.
Drugs are quite prevalent in our society.
It is important to make a decision about your involvement. In order to keep a level head, do not engage. Alcohol and drugs are responsible for too many deaths. Smoking has no value. Don't shorten your time on earth unnecessarily.