In Focus:

Smoke 1 Cigarette a Day? It Can Still Kill You

 If you think having just one cigarette a day won't do any harm, you're wrong.

British researchers say lighting up just once a day was linked to a much higher risk of heart disease and stroke than might be expected.

The bottom line: "No safe level of smoking exists for cardiovascular disease," wrote the team led by Allan Hacksaw, of UCL Cancer Institute at University College, London.

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