You still believe the lie that smokers take from government benefits more than they pay, which is simply false.
One, as I stated before, they die earlier and therefore do not utilize all of the benefits that taxes (paid by all, mind you) provide.
Second, your above assumption is based off of the false idea all smokers who have lung cancer, utilize Medicare. Many have insurance which covers the cost of treatment.
Third, the assumption that they take more than they pay, is based on the false notion that non-smokers die of less costly illnesses. Heart disease treatments can be extremely costly, same for nursing home care, as well as the vast number of non-smoking related cancers that kill.
Lastly, your analogy to AIDS is misleading, since government agencies never once dared to attempt restricting risky behavior which accounts for the vast majority of HIV cases. But I am glad you did mention AIDS. You pay to care for these individuals too, and the cost of HIV treatment is enormous.