You're taking the position that if they put a tax on something you approve of, you're against it, but if they put a tax on something you don't like or it doesn't affect you, then you don't care and it's fine.
That's an oversimplification for something that is way more complicated.
Honestly, this topic has now evolved to what it was truly about in the first place; the extent to which personal liberties should be tolerated when they conflict with the well being of the person(s) and Society at large.
Smoking, over eating and alcohol abuse are inherently destructive habits that have far reaching consequences for the people performing them, and in many cases, for people that have no personal involvement with said habits.
For example, smokers, over eaters and alcohol abusers are at a much greater risk of mortality than people that don't engage in these acts, simply by virtue of their habits. Also, the family members of these people are also placed at a greater risk for being in the same locality and potentially picking up these bad habits.
Now, if these habits only affected the person doing them, then maybe your talk of personal freedom would have more gravitas. But obviously, this isn't the case.
Instead, the combined economic impact of smoking, abuse of alcohol, over eating etc costs Society billions of dollars each year in medical and productivity costs, a long with the impact of personal loss that affects the individuals involved.
Now knowing all of this, is it unreasonable for any government to attempt to dissuade people from engaging in these destructive habits by levying high taxes against them? Particularly when this hasn't always been the case?
You see, not everyone is sensible or strong of will . A lot of people are seemingly incapable of making the right decisions, or lack the strength of will to refrain from over indulgence. If their bad decisions or weak mindedness affected them alone, then perhaps I would agree with you.
But it doesn't. We live in a Society so we're all interconnected one way or another. Your personal liberty should extend only so far as that it does not affect someone else's quality of life.