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Chemicals in cigarette smoke, such as tar and nicotine, cause throat inflammation, leading to increased mucus production that becomes more noticeable while lying down

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The extent to which factors implicated in ever smoking impact public health is qualified by the fact that a subset of those who become ever users progress to smoke at greater levels of smoking frequency, intensity, or duration (Path 3a, Figure 16-1) and hence become a regular smoker, whereas others may smoke infrequently, smoke very little on each smoking day, and discontinue use shortly following initiation (Path 3b, Figure 16-1) (HHS, 2014)

Anyone who has an e-cig wants to quit. E-cigs are helping people such as Bailey quit smoking, but they also are raising alarms among some in the scientific and medical communities