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Heres the interesting part

It may be too early in this emerging market to find evidence of e-cigarettes as a gateway to smoking

Given the persistence of trace metals in the environment, it would be important to better understand the efficacy of ventilation, cleaning, and vacuuming as removal mechanisms for these contaminants. This work was supported by the University of Californias Tobacco Related Disease Research Program

doi:10.1002/2327-6924.12358

Electronic cigarette use enriches periodontal pathogens
