'Dangerous levels' of chemicals in e-cigarette flavours
Smoking flavoured e-cigarettes can produce "unacceptably dangerous" levels of formaldehyde and other carcinogenic compounds, according to a new study.
Researchers at the Desert Research Institute in Nevada found that toxic aldehydes formed when the flavoured liquid was rapidly heated to create vapour.
E-cigarettes are currently sold in thousands of different flavours, with some sweet varieties thought to be particularly appealing to children.
One of the scientists, Professor Andrey Khylstov, said: "How these flavouring compounds in e-cigarette liquids affect the chemical composition and toxicity of the vapour that e-cigarettes produce is practically unknown.
"Our results show that production of toxic aldehydes is exponentially dependent on the concentration of flavouring compounds."