A new assessment of the harms of smoking shows cigarettes shorten life expectancy even more than doctors thought in the past.

Researchers from University College London state that a single cigarette, on average, will extract about 20 minutes off of a person’s life — – 17 minutes for men and 22 minutes for women.

Translated that means a typical pack of 20 smokes will abbreviate a human life by nearly seven hours.

The study from University College London finds that a single cigarette can shorten a person's life by 20 minutes. Quit completely they urge.{ai:summary}<p>A study from University College London reveals that smoking cigarettes reduces life expectancy more than previously understood. On average, each cigarette shortens life by about 20 minutes—17 minutes for men and 22 minutes for women. </p><p>This means a pack of 20 cigarettes can cut nearly seven hours from a person's life. #health</p>

New reasons to quit: one cigarette equals 20 minute off your life, British researchers find

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