WI: The government blocked anti-smoking studies and no one knew it was bad for you

Dangers of smoking would be noticed in another nation. Not way that all governments are going censoring sciencetic results.
 
What would happen if no one ever discovered the health effects of smoking?

Pretty much impossible. The fact smoking was bad for you was noticed very early on.

From the 1890s onwards, associations of tobacco use with cancers and vascular disease were regularly reported.[13] In 1930, Fritz Lickint of Dresden, Germany, published[17][16] a metaanalysis citing 167 other works to link tobacco use to lung cancer.[16] Lickint showed that lung cancer sufferers were likely to be smokers. He also argued that tobacco use was the best way to explain the fact that lung cancer struck men four or five times more often than women (since women smoked much less),[17] and discussed the causal effect of smoking on cancers of the liver and bladder

You'll note even by the 1930's we are discussing how much worse it is for a certain gender or not. Among actual health professionals, there was little doubt about the effects of smoking.

An association between tobacco and heart attacks was first mentioned in the 1930; a large case–control study found a significant association in 1940, but avoided saying anything about cause, on the grounds that such a conclusion would cause controversy and doctors were not yet ready for it
 
Lots of conspiracy theories about the government's motives. People would speculate about Big Tobacco paying off the government, the government wanting tax revenue from cigarette sales, the government wanting people to die off in order to reduce healthcare and Social Security costs, etc.
 
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