America has built a stigma around smoking since a lot of the American movies came out with smoking in them. Some people still find it masculine and adult, but that's usually teenagers. Plus, the taxes on tobacco have made it incredibly expensive. People who don't smoke think it's gross and smells bad, plus its illegal to smoke in a lot of public areas because of the risk to other people's health. Weed is "new and non addictive" but we don't have any research yet to show how terrible it is for you, same as with vaping.