When you ask someone if tight restrictions on smoking are a good thing, they'll usually say yes. When you ask why, they'll say because it's addictive and unhealthy. When you follow up by asking them if kids should be allowed to eat sugar, their brain breaks.
One segment of society is very familiar with the slippery slope.
Banning cigarette ads is not only a form of censorship, but also a form of propaganda. When nobody sees people smoking in any media, they are slowly trained into thinking of it as an abnormal behavior. Abnormal behavior means "abnormal" people are the only ones who would do such a thing.
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