We regulate certain things more or less out of existence because they're dangerous. Certain types of products which people can't or won't make themselves can be prohibited from sale, for example. I generally am in favor of legalizing things and enforcing laws against fraud, so that people get honest information about consequences, but I also like for people to be protected from other people.
Tobacco products are my favorite example because they affect people who aren't even using them. We allow them to persist only because of a profitable and highly taxable industry, not because of any notions about freedom. Freedom would be to permit you to grow your own instead of enabling the cancer stick industry, and let all the smokers move to farms in the south.
And people are doing just that - growing their own tobacco, and rolling cigars out of the results.
This is not in contradiction to what you wrote, just a question of how far we go to protect people. Somehow I ended up in a Youtube rabbit hole for a while of people growing tobacco and rolling cigars. I haven't smoked for 50 years, but it was interesting. Fun fact - it takes two different types of leaves, one for the wrap and one for the filler. And Tobacco is actually an attractive ornamental plant as well.
But where we stop protecting others makes for an interesting discussion. And another rabbit hole. Do we want people to be protected from other people? How do we address the heterocyclic amines and polycyclic aromatic hydrocarbons created when we barbecue meat, or smoke foods? If we ever give another person any of those products, they are ingesting carcinogens that we intentionally created.
Cured meat like bacon Nitrate - Cancer risk, Problem is, most nitrate exposure in humans is from vegetables. Uncured bacon? A lie, because it uses celery juice, which is high in nitrates, which cures the meat.
In the end, I can't resolve the issues completely, because it is a spectrum. And even becoming a raw food vegan doesn't eliminate the risk of ingesting things that can eventually cause a life ending illness.
So in the end, while smoking tobacco isn't a good habit, and chewing it is disgusting, as long as a person doesn't do it around others who object, I'm cool with it. And we'll never eliminate it anyhow.