Smoking a pack a day causes 150 mutations in every lung cell, research shows

School students stand around an ashtray on the pavement outside their school in NiceBy Kate Kelland LONDON (Reuters) – Scientists have found that smoking a pack a day of cigarettes can cause 150 damaging changes to a smoker's lung cells each year. The findings come from a study of the devastating genetic damage, or mutations, caused by smoking in various organs in the body. Publishing in the journal Science on Thursday, the researchers said the findings show a direct link between the number of cigarettes smoked in a lifetime and the number of mutations in the DNA of cancerous tumors.

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