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Some cigarettes today boast the inclusion of a "charcoal filter" in addition to the more common dense, synthetic fiber filters seen in almost all filter cigarettes

48 Children and pregnant women are particularly at risk, and yet many waterpipe venues lack ventilation regulations or smoke-free zones

Over time, the bodys immune system responds to the fibers

One such menace is passive smoking, a silent threat that affects millions around the world

Their findings, published in the journal Nature Medicine , highlighted a molecule present in the beige fat of mice and humans called CHRNA2 (cholinergic receptor nicotinic alpha 2), a protein that plays a role in thermogenesis