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While the vapour from e-cigarettes is certainly less toxic than tobacco smoke, there's still a few problems with them. Firstly, the public health perspective is that it would "re-normalise" smoking, which has slowly become more and more socially unacceptable in most situations, leading people to want to quit.
And secondly, nicotine is still bad for you - its the ingredient that damages blood vessels including the tiny retinal blood vessels in our eyes, that we rely on for astronomy.
So my advice as a former smoker who had a lot of trouble giving up - if you're going to use the e-cigarettes to help you quit the nicotine habit - then all the best, but if you're going to use them long term, they'll still cause coronary artery disease, eye disease, kidney disease etc, so just use them as a tool to quit the nicotine habit altogether. Good luck.
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