how long has tobacco been around History of Tobacco: A Lucrative Vice Tobacco - The National Archives

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The mothers who smoked during pregnancy scored their children higher on the questions that measured toddler negativity

For example, while we emphasize the importance of considering pack years to estimate cigarette smoke exposure, we recognize the potential for unmeasured confounding that is not captured by pack years, which has been shown to be an imperfect measure of overall cigarette smoking history

The trade-offs are cost ($400-800+ for complete systems), installation complexity (plumbing into the cooling system, running hoses, mounting components), and they only work well after your engine warms up

But despite this impressive trajectoryand the abrupt shift in public perception that has accompanied itpublic-health researchers argue that theres actually not a lot of scientific evidence backing up popular justifications for smoking bans