4. "No significant increase was observed for the toxic and potentially carcinogenic elements cadmium, arsenic and thallium."

As tobacco control advocates commemorate the 50th anniversary of the release of the 1964 Surgeon General's report on smoking by Dr. Luther Terry, we are praising Dr. Terry for his groundbreaking and pivotal work that many view as having started the tobacco control movement. Dr. Terry served as Surgeon General of the United States Public Health Service from 1961 to 1965.

The authors write: "Consistent with the only other longitudinal population-level study with 1-year follow-up that we are aware of, we found that e-cigarette use by smokers was not followed by greater rates of quitting or by reduction in cigarette consumption 1 year later."

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