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A main ingredient in the liquid cartridges, polyethylene glycol, is FDA-approved and is used in many consumer products

In order to translate observed breathing patterns and smoking behavior into biological effects, we combined the small airway-on-a-chip with a smoking machine that burns cigarettes and a microrespirator that inhales and exhales small volumes of cigarette smoke and fresh air in and out of the epithelium-lined channel in programmable intervals mimicking true smoking behavior, said Richard Novak, a co-author of the study and a senior staff engineer at the Wyss Institute, who helped design the smoking instrument

Under the law, the agency was required to issue rules by late 2011 for color graphics on cigarettes that depict the harms of smoking

The matchbox cover still has (an empty) box of matches

Dietary interventions, including increased fruit and vegetable intake and decreased meat intake, may counteract some of smokings harmful effects on the human body