Because they are addicted, and can't stop. If they have taken it even just a few times before then they can become seriously addicted, and it could kill them if they just.. stopped.
You need to know not to do them while you are pregnant. You need to know not to do any drug that doesn't come from the earth. You need to know when to get high and when not to.
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...