Third-hand smoke - tobacco residue that persist in houses, apartments and hotel rooms after smokers move out - may be just as deadly as first-hand or second-hand smoke, a new study has claimed. "Do not smoke and do not allow yourself to be exposed to smoke because second-hand smoke and third-hand smoke are just as deadly as first-hand smoke," said a scientist from the University of California, Riverside who led the first animal study of the effects of third-hand smoke. While first-hand smoke refers to the smoke inhaled by a smoker and second-hand smoke to the exhaled smoke and other substances emanating from a burning cigarette that can get inhaled by others, third-hand smoke is the second-hand smoke that gets left on the surfaces of objects, ages over time and becomes progressively more toxic. "We studied, on mice, the effects of third-hand smoke on several organ systems under conditions that simulated third-hand smoke exposure of humans," said ...
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