The result for adults is generally not as strong, Kathryn Wilson of Kent State University wrote
E-cigarette use behaviors and device characteristics of daily exclusive e-cigarette users in Maryland: Implications for product toxicity
They were installed in known hotspots, identified by concentrations of cigarette butts (in Union Square, these areas included nightclubs, youth hostels, and near trash cans)
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Millions of people in the world who smoke are ignorant of the effects of smoking on their health, environment and other people around them