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Starting in the 1990s, governments started taking tobacco prevention seriously. They removed vending machines, taxed cigarettes, banned smoking in bars and prevented marketing anywhere kids might see it. I think in the next 10 years you'll see the same thing with soda.
While adult smoking rates in the general population were cut in half between 1965 and 2004, the ratio of heavy and dependent smokers who meet the psychiatric definition of "nicotine dependence" is steadily rising.