1. Second hand smoke
... up to fifty times the number of carcinogens found in mainstream smoke. A study reported by the National Institute of Environmental Health Sciences confirms that second-hand smoke contains up to fifty times more carcinogens. Carcinogens are described in the Webster's dictionary as being a substance that produces a malignant tumor, or ... conditions, and assorted respiratory problems by being exposed to the smoke for a period of time. Even perfectly healthy people are affected by second-hand smoke. Their heart rate, blood pressure, and the level of carbon monoxide in the blood increase whe...
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