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Smokers have an increase in the volume and viscosity of secretions, which when coupled with ciliary dysfunction, leads to a loss of protective mucus clearance

Give it at least a couple of feet of open space on all sides and place it as close to the source of the smoke as you can

doi:10.1002/14651858.CD004150.pub4

The researchers note in their paper: This effect is consistent with the buildup of polymerization byproducts on or near the coil leading to accumulation of the sort of residues that are often referred to in the blogosphere as coil gunk or caramelization. Heating these residues would provide a secondary source of volatile aldehydes. Lastly, because many e-cigarettes allow users to control the voltage, the researchers systematically investigated the effect of voltage on emissions

It was copied onto 35mm in 1995 from the paper print submitted by the Edison Manufacturing Company for copyright in 1897.

It becomes an issue when people overuse marijuana