Pharmaceutical companies.
There is no legal market for this product and it's a highly valuable commodity, hard to compare.
As above, except there are some legal markets now.
Liquor is pretty easy to make. You'll need vast fields of tobacco to make a profit from cigarettes. Hard to do that out in the open if there's no substantial legal market for it or if most of the production goes to providing nicotine for vaping, patches and gum. They'll also have to compete with legal forms of nicotine, which will deter a lot of people from the illegal market.
Maybe they will grow it in Mexico, but they'll still need to smuggle it into different markets.
Realistically, though, when it becomes almost impossible to get cigarettes addicts will move to vaping and not go back. The immediate benefits are so impactful that they will kick themselves for not doing it sooner.