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[5] Many substances in cigarette smoke, chiefly nicotine, trigger chemical reactions in nerve endings, which heighten heart rate, alertness [6] and reaction time, among other things

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In contrast, intravenous or vapor self-administration protocols allow for the examination of the motivational and reinforcing drug properties that lead to continued use and seeking behaviors, allowing researchers to investigate different aspects of addiction processes

There are two major categories of humidifiers: cool mist humidifiers and warm mist humidifiers also known as vaporizers