Dangers of smoking

People who smoke a pack of cigarettes each day for a year develop on average 150 extra mutations in their DNA in every lung cell, and nearly 100 more DNA mutations than usual in each cell of the voice box, researchers found. More still build up in the mouth, bladder, liver and other organs. Some 70 chemicals in tobacco smoke are known to cause cancer, some damaging DNA directly or changing the ways cells function, but the more mutations in the DNA, the more likely the cell could turn cancerous.

 

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