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In spite of its risks, tobacco companies have been eager to point out that snus is safer than cigarettes

First author, Dr Kate Gowers (Lungs for Living Research Centre at UCL), said: Our study is the first time that scientists have looked in detail at the genetic effects of smoking on individual healthy lung cells

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This is the earliest direct biomolecular evidence of betel nut use in south-east Asia. We demonstrate that dental calculus can preserve chemical signatures of psychoactive plant use for millennia, even when conventional archaeological evidence is completely absent, added Dr

A whitetail may approach a treestand from crosswind or while quartering into the wind without smelling a stand-hunter in a tree (or on the ground) and the inexperienced fawns or yearlings sometimes completely ignore human odors altogether while approaching from directly downwind