That's absolutely true!! People need to be responsible of their own actions, if they entered that world I think they should know they have all the power to exit as well as you did with the alcohol.
There have been many victims of people who abused of alcohol and this one isn't forbidden, but that's enough reason to forbid it? I don't think so, many people drink alcohol but never hurt anyone else. Same will happen with drugs, it's everything on the person.