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Vapes confiscated from children at a secondary school had more than twice the safe level of lead and more than nine times that of nickel. The investigation al

Tobacco smoking causes cancers and a whole range of life-limiting diseases. The active ingredient of tobacco, nicotine [1], is one of the most addictive substances known. As well as denying or suppressing the evidence of smoking harm, tobacco companies have also researched safer ways to deliver nicotine. The problems with smoking are mainly tar, nicotine and carbon monoxide (CO). The invention 20 years ago of the e-cigarette enabled nicotine to be delivered without the tar and CO.

Nicotine-free vapes are now raising concerns. Here's what tests revealed about these e-cigarettes.

Data shared by Inter Scientific - which offers analytical testing of products to check they are following regulations - examined more than 50 vape brands sold across England and Wales.

Tests based on brands sold in the UK have revealed that some vape devices which claim to omit nicotine actually contain an amount comparable to full-strength e-cigarettes.