Cannabis smoke 'has more toxins'
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Inhaled cannabis smoke has significantly more toxins than tobacco, a study suggests.
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Secondhand smoke can cause cancer. It&#39;s what the surgeon general says. So too the Environmental Protection Agency. And the World Health Organization.
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Here&#39;s one more reason not to smoke  -- smoking may damage sperm, passing along genetic damage to a  man&#39;s children, Canadian researchers report.
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Cigarette smoke produces 10 times more air pollution than diesel car exhaust, research suggests.
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Some young people who smoke cannabis are at real risk of developing psychotic mental illness, according to a major study announced yesterday.
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By GRAEME SMITH  SCOTTISH scientists who have achieved a major breakthrough in the understanding of how the brain develops are warning that smoking cannabis during pregnancy could affect the unborn child.
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People who smoke are more likely to develop Alzheimer's disease and other forms of dementia than people who have quit or have never smoked, Dutch researchers reported on Sunday.
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NEW YORK  - People who use chewing tobacco expose themselves to even higher levels of a particular cancer-causing compound than tobacco smokers do, according to a new study.
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Children regularly exposed to passive smoke are up to three times more likely to get lung cancer, researchers say.
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Smoking a joint is equivalent to 20 cigarettes in terms of lung cancer risk, scientists in New Zealand have found, as they warned of an "epidemic" of lung cancers linked to cannabis.
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The chemical in cannabis that produces a high may help to combat cancer, research suggests.
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High levels of secondhand smoke on the job can double nonsmokers' risk of developing lung cancer, and those who inhale it at work long-term face a 50 percent higher risk, researchers said on Wednesday.
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Women who smoke are more likely to develop a form of acne than those who do not, research suggests.
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Children exposed to passive smoking are likely to do worse at school than their peers, research suggests.
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A British health charity called on  Saturday for an investigation into evidence that smoking  cannabis may cause psychosis in people at risk of mental  illness.
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The latest research into the damage smoking could cause suggests the habit may affect your IQ.
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Smokers may be at greater risk of HIV infection compared with non-smokers, research suggests.