Nicotine shortens REM sleep - the stage where emotions are processed and memory is consolidated
Any effect it has comes through nicotine's influence on appetite and metabolism and those effects are modest, inconsistent, and tend to fade over time
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Both reports show the links between smoking and lung cancer, as well as heart attack, stroke and the severe lung disease, chronic obstructive pulmonary disease
many of these substances are known irritants or can increase susceptibility to viral infections.2224 As a consequence of the structure of the device itself, many different heavy metals, such as chromium, manganese and even arsenic, have been reported to be detected in electronic cigarette liquids and aerosols