Libertarians think everyone should be allowed to decide what is good or bad for her/his own body. Libertarians think if people want to drive cars without wearing seat belts, it is their own choice. They should not be forcibly stopped from doing that, not even by the state. If a person wants to donate all of her/his money to a charity, or waste it all gambling, that is also something she/he should decide for herself/himself. No one should be forcibly stopped from doing that, not even by the state. Libertarians even say that if adults want to use harmful drugs, they should be allowed to do that, even if it spoils their lives. It is the drug user's own choice because it is the drug user's own body. As long as the drug user does not start using violence against other people or their legitimate property, no one should use violence against the drug user or the drug user's legitimate property, not even the government.