I believe you're misunderstanding his/her post. The point is that, in a non-corrupt society, the concept of 'sin tax' is to cover the costs of detriment down the road. So, if I smoke cigarettes and pay a sin tax on them, then theoretically, this money should be used to help cover my health expenses down the road since I'll end up paying more money in sin tax than I'll need for health costs anyway (meaning the state still profits). However, that's not the case here in the states. We get taxed on damn near everything, and our tax money gets used for things we generally don't agree with like war, surveillance expansion, bank bail outs, etc.
I think what FXD was saying is 'look, if you're going to tax me because my unhealthy habit costs money down the road, then use that money for whatever it is that my habit ends up costing, rather than things I have no relation to'.