It has the potential to lead to one of the greatest public health breakthroughs in human history by fundamentally changing the forecast of a billion cigarette-caused deaths this century." E-Cigarettes - No Toxic Effects from Inhaled Propylene Glycol Aerosol One of the key ingredients in many e-cigarette liquids is propylene glycol (PG), described by Wikipedia (here) as a colorless, nearly odorless, clear, viscous liquid with a faintly sweet taste The entry also explains that PG is used as a moisturizer in medicines, cosmetics, food, toothpaste, shampoo, mouth wash, hair care and tobacco products, in smoke machines to make artificial smoke for use in firefighters' training and theatrical productions and as a moisture stabilizer (humectant) for snus among many other applications
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But see your doctor because it can lead to bleeding or stomach ulcers
The smell clings to every soft surface, seats, headliner, carpet, and floor mats, while tar and nicotine residue coat hard surfaces like the dashboard, steering wheel, and glass
Some wonder if they really help, and others want to know if they are just a marketing claim
