Why do they buy drugs when they know its bad?

I'm not on drugs but I know people who have been on drugs. People who take drugs are first of all insecure because they usually take drugs to fit in. The other reason people take drugs is to get the feeling of being high. High is a way to describe an adrenaline rush or sudden excitement or good feeling. All in all please never take drugs it is the worst decision you could ever make, not to mention it could kill you the first time you use it.