I wasn't aware that this was even debateable. Free people can choose to give up their inalienable rights any time they want. Agoraphobics imprison themselves, some people choose not to own a gun, vegatarians restrict their own diet, others choose not to vote etc... The list goes on and on. This things neither bother or effect me. So why should I care if someone smokes crack until they croak? Seriously. I'm not a moral liberal, but I am not out to save humanity either. All I can do is take care of my own.
Of course you are wrong. People have no right to end their own lives just as they have no right to consent to slavery. That some people have the POWER to end their own lives is not the same as exercising a right. They may have the power to rape and rob and murder, too, but we don't assign rights to those activities, either, at least not yet in this this current moral slide advocated by libertarians.