People who smoke, take street drugs or become heavy drinkers may be genetically predisposed to their habits, suggest the results of a large new study. By combining 46 previous studies, scientists have definitively linked two genes to personality traits thought to make people more likely to take up risky lifestyles.

The analysis of the data from over 20,000 people linked a particular version of a gene for the transport of the neurotransmitter serotonin - 5HTT-LPR - to having a more anxious, neurotic personality.

View: Full Article | Source: Yahoo News

I knew about the heavy drinking, but didn't about the street drugs. Interesting article.~~Heather

I had heard of addictive personalities before .. This must be what causes them .