From Yahoo News/Health Day:
FRIDAY, Dec. 18 (HealthDay News) -- The genes that make people susceptible to alcoholism also make them prone to becoming addicted to marijuana, a new study suggests.
Researchers interviewed almost 6,300 men and women aged 24 to 36, including almost 2,800 sets of twins who were part of the Australian Twin Registry, about their use of alcohol and marijuana over their lifetime.
Twins are valuable to researchers in determining the role of genetics in various diseases or conditions because identical twins share 100 percent of their genes, while fraternal twins share 50 percent of their genes, the same as other siblings.
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