Nicotine by itself is a colourless substance, but when mixed with oxygen it turns yellow
This study found that compared with nonusers, e-cigarette users were 56 percent more likely to have a heart attack and 30 percent more likely to suffer a stroke
Studies have shown there are worrying fluctuations in the levels of nicotine they provide users with, which is why further research and better regulation are essential." From 2016 e-cigarettes will be classed as medicines by the Medicines and Healthcare Products Regulatory Agency (MHRA), which means they will undergo rigorous tests
The coalition called that approach fundamentally flawed, stating that youth flavor preferences change rapidly, often in response to regulatory actions and product availability
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