They think they feel better after using them. This is the worst reason to use drugs because if you think that it is good for you then you are on the totally wrong side of the argument. Also, if you think its good for you then you are going to keep using it and it can ruin you even more.
If you think that doing drugs is fun then you are in trouble with life going on, because most people spend there lives doing the things they love and that they think are fun. So if you think drugs are fun then you will not live long or you will live miserably.
If you think that drugs calms you down, which for most people this is true, but when you get all angry or something and you need to calm down and you go and do drugs then you will get even more tensed. this is because if you are aggravated most likely its because of the drugs, so if you take more to calm down then you will be even more angry.
If you think that you absolutely cant go without drugs you need serious help because then you think that you cant live without it and then you will do it even more and then you will be in serious trouble in life going on.