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Yeah, exactly

Of all the included studies, only seven evaluated the effects of electronic cigarettes in a healthy non-tobacco smoking population, these studies revealed significant effects, including increases in heart rate, mean arterial blood pressure, arterial stiffness, and oxidative stress, as well as respiratory system changes such as alterations in the transcriptomes of the respiratory epithelium and alveolar macrophages, and a sudden increase in airflow resistance suggesting airway obstruction

and also the last date an item should be used before it is likely to lose flavor and quality

(source: Further Information A video of Until Death Do Us Part.

I think this is the primary reason it has gone unnoticed by tobacco control researchers, institutions, media, etc." But that is changing