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This gave rise to the second generation of e-cigarettes, called mid-sized models or vape pens (for their pen-like appearance)

and with as many as 25 cigarettes in a pack (and boxes sold conveniently), a smoker has a ready supply to keep nicotine intake going throughout the day

But there is no easy answer, says Andrew Black at the frameworks secretariat

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