The trouble with your reasoning here is the idea you can protect people from themselves. The second problem is that heart disease is the biggest killer, and there's no rational way to use the law to stop that.
Extreme sports, fast cars, alcohol, boxing, hell, even gymnastics, unprotected sex.. you see where I'm going with this.
What's moral is a separate question of, what's the best policy for society to keep people as safe as possible. Bootleg cigarettes and fines (prison?) are probably not those things.
Besides, some people can smoke moderately or rarely and not get addicted or die.
Finally, you're too soft on your alcohol prohibition stance, where you're saying you can see the benefits. Empirically, do you see the benefits in the creation of a criminal syndicate that still exists, a century later? History has spoken, prohibition causes harm.