In an era where more people are smoking weed or vaping, tobacco will never become illegal.
I hear some states have actually lowered the cost of cigs. Likely cause fewer people are buying em (fewer YOUNG people esoecially). But it's more like modern generations going to the weed for smoking in general.
The other reason why cig sales have decreased in recent times is some longtime smokers switched to making their own cigs. I even heard of smokers who grow their own tobacco at home.
RYO/MYO cigs are a lot cheaper than premade cigs of course.