American teenagers who regularly have family dinners are much less likely to have used drugs, alcohol or marijuana compared to their peers who have family dinners infrequently, according to a new study - The Importance of Family Dinners VI - carried out by researchers from The National Center on Addiction and Substance Abuse (CASA), Columbia University. Those defined as having family dinners frequently did so from five to seven times per week, while those who had family dinners fewer than three times a week had infrequent family dinners... 
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