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UNDATED (CNN) -- Doctors should counsel children and teens on smoking to keep them from starting the habit. That's the new guidelines given from the U.S. Preventative Services Task Force.

It's a departure from the strategy given in 2003 that indicated there was no clear reason to recommend for or against doctors talking to young patients about smoking.

Doctors with the task force say that new data shows that 90 percent of adults started smoking before they were 19-years-old.

Doctors also say community-based involvement is highly effective and has helped to reduce smoking.

The idea is that if teens hear the same message about smoking at home, school and the doctor's office they are more likely to listen.

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