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Humidity can worsen the problem by locking in scents and preventing them from evaporating

Daniel Croft, a pulmonologist who has treated 11 vaping injuries at University of Rochester Medical Centers Strong Memorial Hospital, says investigators there aren't able to "implicate or exonerate" nicotine vaping as contributing to the lung illnesses

Toxicol., 23: 66-73

There is also evidence to suggest that those who previously smoked have a slightly lowered risk of developing colorectal cancers compared with those who continue to actively smoke, with the risk decreasing as the number of years since cessation increased (up to 40 years)

a priority for a large-diameter smoking article may be a general filtration of a number of different constituents, due to the fact that a higher overall level of tar and nicotine is expected from the larger tobacco rod