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Description
In the four years following implementation of the law, youth smoking rates in Needham decreased by approximately half, from 13% to 6.7%

Plus de dtails propos des bnfices de larrt du tabac sur le risque de maladies cancreuses dans le prsent article

While occasionally smoking a pipe may be less harmful than smoking cigarettes regularly, no form of smoking is entirely safe, and even occasional smoking carries health risks

Photoelectric detectors, on the other hand, use a light source and a light sensor
World Health Organization: 800