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A San Francisco transplant surgeon is accused of speeding up the death of a patient to obtain his organs.

A Swiss firm recalls its food additives from the market after reports it has been contaminated by the toxin, dioxin.

An office laser printer can cause damage to the lungs in the same way as cigarettes, Australian scientists say.

Smoking a cannabis joint could cause as much lung damage as up to five tobacco cigarettes, scientists say.

Low levels of exposure to air pollution can still increase the risk of dying early, a study says.