I'm fine with leaving chronic smokers and drug abusers out. If you've been told what you are doing is bad for you, and society, and you continue anyway, you've made your choice. There are levels of alcohol which are safe (even healthy).  I don't drink personally, but I respect when people make responsible choices.  Tobacco and hard drugs are not part of responsible choices. I'm not demanding pain killers.  I'm demanding a stratification of society into humans and non-humans.