To explore how these changes to DNA take root in the foetus, the international team of scientists conducted a meta-analysis of 13 prior, smaller studies, some of which had suggested links between smoking and chemical modifications to DNA, also known as methylation
The lit end of cigarettes can reach temperatures around and above 600 degrees C, causing the tobacco to burn, and it is known that the majority of harmful chemicals in cigarette smoke comes from this combustion
This compound is used in fuels
One new brand of e-cigarette, whose name has not been made public, showed a more than 10-fold increase in formaldehyde levels in nine out of every 10 sets
However, eliquid tends to be primarily oil-based, containing 4 key ingredients: propylene glycol and/or vegetable glycerine, flavourings, and often nicotine