Oxidation of both PG and glycerol can generate formaldehyde, although a predominance of glycerol can be observed
We know that smoking tobacco is very dangerous, leading to COPD or lung cancer
An e-cigarette uses an e-liquid that may contain nicotine (typically derived from the tobacco plant), glycerin, propylene glycol, flavorings, and other ingredients
These nasties contribute to air pollution and can linger in the atmosphere, affecting both indoor and outdoor air quality
The study, published in the journal Tobacco Control, said: 'Despite tobacco companies emphasising the importance of RRP, small retailers implemented small increases above RRP as standardised packaging was introduced