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San Franciscos Board of Supervisors voted unanimously on Tuesday to raise the legal age to buy tobacco products to 21 from 18, joining New York City, Boston and Hawaii in lifting the minimum age

Electronic cigarettes are legal too, and sales to minors (defined as those under 17) are officially banned, as are cigarette vending machines

At the end of the activity, we surveyed people about their smoking habits to test whether the results differ between smokers and non-smokers

Simulated environmental tobacco smoke [edit] To study the consequences of passive smoking, scientists expose animals to sidestream smoke, that which emanates from the cigarette's burning cone and through its paper, or a combination of mainstream and sidestream smoke