As long as we have any publicly funded health care, then government is paying for the health consequences of smoking. With that in mind, why is it wrong to tax a behavior that increases an individual's societal burden?

Individual behavior that has a societal cost should be fair game for targeted taxes. In many cases I think that allowing someone the freedom to engage in the costly behavior while asking them to compensate society for the privilege is preferable to an outright ban on the behavior.

WoW runs just fine on my Mac