Well, the strategy is to reduce the smoking percentage of the population to an amount, that the remaining smokers will not have enough power to fight a legislation to prohibit tobacco. This could be 10% or 6%, but this calculation is for sure already been done. But there is a catch to it. The tax money, that is lost, has to come from somewhere else. Maybe from other drugs, but who knows. It could be e-cigarettes. Currently they are not taxed, but this could change very quickly. I think, it is clear, that the projected path is to stop tobacco usage altogether and they could be successful with it in around 15-20 years.
The difference to pot is, that you can't smoke pot all day and still live a normal life, as much as you can't drink all day, but you can easily smoke 3 packs a day and have no mental influence. Of course, there will be pot abusers, who will be stoned all day, like there are people who are drunk most of their wake time, but this is only a tiny percentage and eventually they will end up in a clinic or on the streets. Anyway, a certain lethargy makes it even easier for the government to guide the sheep. If you leave reality for a dream world, you don't really care for the bad things.