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Ronald Bayer, a Columbia University professor, told CBS News in 2013 that "the evidence of a risk to people in open-air settings is flimsy." In a 2013 study published in Health Affairs , Bayer and Kathleen Bachynski, now a public health professor at Muhlenberg College, found that the evidence for outdoor smoking bans was "far from definitive and in some cases weak." The impetus for these bans, meanwhile, is "the imperative to denormalize smoking." The paper also concludes that, while denormalizing smoking may prove effective in the short term, "it is hazardous for public health policy makers, for whom public trust is essential." If San Francisco lawmakers are concerned with improving public health outcomes, the evidence-based solution would not be draconian bans, but harm reduction

Manning et al., The Taxes of Sin: Do Smokers and Drinkers Pay Their Way? JAMA 261, no

Smoking can damage olfactory nerves in your nose

For anyone concerned about vape strength, vape puffs vs cigarette nicotine, or just looking to understand the difference, its worth digging into the detailsor better yet, speaking with a health professional

However, they contain nicotine among other harmful substances that make their second-hand smoke damaging