e pen cigarette E-cigarettes: How they work, risks,

It took nearly a century of scientific investigation from the mid-1800s to the landmark US Surgeon Generals report in 1964 before smoking was officially recognized as a cause of lung cancer, the researchers said, according to a news release

Smoking just one cigarette a day (compared to not smoking) was associated with largest increase in risk for developing these diseases relative to the number of cigarettes smoked per day

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42 Still, 38.9% said they were former smokers, suggesting a significant portion of young adults used e-cigs as a smoking alternative