is the smoke from e cigarettes harmful Health Issues - What's Harm? The evidence keeps piling up:

About one in 5 adults smoke, and its one of the main factors of gum disease

"Our research suggests smoking is bad for aspects of psychological and social health in addition to the well established physical impacts of smoking," said study author, Dr Keir Philip, from Imperials National Heart & Lung Institute

The cigarette's emissions were funnelled into real-time instruments, and filter samples were collected for physical and chemical characterisation of particles

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Due to Boyle's Law , as the volume of a space decreases, the pressure of the contents rises, so with lots of gas firing outwards with great aplomb in a teensy weensy shaft, there's going to be lots of energy with nowhere to go