Reported by Drs. Tiffany Chao and Shari Barnett: Teenagers lighting joints may end up less bright, according to new research released Monday. In a study of more than 1,000 adolescents in New Zealand, those who began habitually smoking marijuana before age 18 showed an eight-point drop...Read more http://feeds.abcnews.com/click.phdo?i=c1c8165ea244f45bde073d578894133b
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