what kind of a world?

From Ezra Klein:

Quick thought experiment: if a martian landed on this planet, and you explained to him that there were these two types of cigarettes, one that was violently addictive and increased your susceptibility to a deadly disease by 2000%, and another that was pleasant, non-addictive, and protective against the killer ailment, which do you think our friendly neighborhood martian would theorize we keep legal?

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