Stronger suction is required to smoke “electronic cigarettes” — marketed as tobacco-free nicotine delivery systems — than conventional brands, with possible adverse effects on human health, researchers at the University of California, Riverside report.
The researchers used a smoking machine to compare the smoking properties of eight conventional cigarettes with five e-cigarette brands. They examined the vacuum required to produce smoke (in the case of conventional cigarettes) or aerosol (in the case of e-cigarettes), and compared the density of the smoke/aerosol over time.