The effects of tobacco are relatively isolated to those who use it. Granted it does raise overall costs for healthcare. But in the US, we often control second hand effects by regulating, heavily, where you can smoke (at least in public, and at the local/state levels).

Alcohol, is generally only dangerous when overused/abused. The poison is in the dose, not the substance. So we do criminalize and regulate how you can interact in public while under the influence. You can’t drive or operate machinery because those are the primary ways that alcohol will affect someone else.

But in general aside from community effects, we tend to think that people are responsible for their own individual health. Granted we do criminalize and ban other drugs that tend to be more addictive and dangerous. But I think that’s simply because tobacco and alcohol are just old and are institutions (at least in “western” cultures). There’s just not enough will to fully ban them.