We banned cigarette ads decades ago because of the realisation that such ads normalised and encouraged smoking.
That's an interesting point. I used to be a graphic designer, and I learned that designing an ad or any other graphic meant for public viewing is very tricky business. People generally ignore ads and do not respond to them by buying the product promoted. But of course an effective ad can increase sales and no doubt many cigarette ads do increase the sales and consumption of some brands of cigarettes. Anyway, here we are years after the censorship of cigarette ads, and people still smoke and get sick from smoking. Yes, the problem is not as bad as it used to be, but to credit censorship is not necessarily fair because other factors may have achieved the progress.