Many people might be wondering why Denver shoould stop with one street. 
Sure, they will claim, smokers have "rights" but then they will ask why should their "right" to stink up the air with the tobacco smoke be more important than everyone enjoying a smoke-free environment? 
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And, you know, I don't have a good answer. No one smokes cigarrettes for "health" reasons.....and its not akin to breast feeding a baby in public because cigarrettes don't provide any nourishment to anyone.