Is getting high a sinn?
Not on the surface, however, if you are getting high and neglecting the other things that you should be doing it could be considered sinful. If you are using money that could be used for good works it could be considered sinful. If you commit bad deeds while high it could be considered sinful. If you become addicted and harm those around you (not just physically, but emotionally and economically as well) then it could be considered sinful. It is stupid, regardless of the sin attached. Some people are biologically prone to addiction and using once or twice might send them on a downward spiral. Why take the risk? Be responsible. Be smart.