Just checkin'... you DO feel exactly the same way about tobacco smokers and alcohol drinkers and red-meat eaters, right? No taxpayer dollars for smokers' and drinkers' and red-meat-eaters' illnesses, like cancer, cirrhosis, heart disease? They all make their own choices, and can live and die with it.
(It happens, being of the libertarian persuasion, I DO feel exactly that way. I'm just making sure I understand your statement, and that we agree.)
With regards to taxpayer money, if you can tie a specific behavior to the disease, yes.
That said, it is in the realm of possibility that cancer, cirrhosis, and heart disease are genetic or age-related, correct? So those cannot be painted with the same broad brush in my opinion. But without question AIDS and certain other diseases, you cannot contract genetically/without an external influence, which in almost all cases today are caused by sexual contact.
Last time I checked, smokers are more than paying their fair share into the government coffers.