Are drugs wrong?

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I hate drugs and I hate people who do them. The people who do drugs are useless, pathetic excuses for human beings. I refuse to date anyone who does drugs and don't even hang out with anyone who does them because those people tend to suck the life out of me. They do not realize the harm they are doing to everyone else around them. My sister just found out today that her boyfriend us using cocaine. She wanted advice from me in terms of what she should do. Before she got serious with this guy, she told him that she has a zero policy on drugs and will not date anyone who does them and would break up with him if he does them. He promised her he wouldn't and now has broken his promise and she is very hurt and angry. I told her that she should break up with him, no questions asked. He was warned and he still chose to hurt her and in the end has chosen drugs over her. I say he's a useless idiot and not worth anyone's time. What do you thin?