Study: Cigarettes contain more nicotine

A U.S. study suggests the nicotine content of cigarettes has increased during recent years, making it tougher for smokers to quit.

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<p><a href="http://www.physorg.com/news76166479.html">Study: Cigarettes contain more nicotine</a></p> <p>A U.S. study suggests the nicotine content of cigarettes has increased during recent years, making it tougher for smokers to quit. </p>