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. You may have heard of it. Garbage In - Garbage Out. So it is with you. Be highly critical of what you put into yourself.