People take drugs because drugs make them feel better. And some people have a deeper need to feel better than others.

Here is something people who don't take drugs often forget: No one takes drugs because he wants to break the law, or end his marriage, or wind up crusty and homeless, or accidentally break into someone's house and fall asleep there because it looks sort of familiar. People take drugs because drugs make them feel better. And some people have a deeper need to feel better than others. (Los Angeles Times)