Cannabis harm worse than tobacco
Smoking a cannabis joint could cause as much lung damage as up to five tobacco cigarettes, scientists say.
Smoking a cannabis joint could cause as much lung damage as up to five tobacco cigarettes, scientists say.
Scientists discover a gene for left-handedness - which may also increase the risk of mental health problems.
Low levels of exposure to air pollution can still increase the risk of dying early, a study says.
Many people worry unnecessarily about hereditary cancer, a survey shows.
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