Put down that blunt, brothers

A study of 369 Seattle men found that regular marijuana use, especially when begun at an early age, may double a man's risk of testicular cancer

Men who smoked marijuana once a week or began to use the substance on a long-term basis while adolescents incurred double the risk for developing a fastest-spreading version of testicular cancer — nonseminoma — which accounts for about 40 percent of all cases, researchers announced today.

"Since we know that the incidence of testicular cancer has been rising in our country and in Europe over the last 40 years and that marijuana use has also risen over the same time, it seemed logical that there might be an association between the two," said study co-author Janet Daling, an epidemiologist and member of the Fred Hutchinson Cancer Research Center’s public health sciences division in Seattle. "And when I analyzed the data, we found a fairly strong relationship with this aggressive type of testicular cancer."

The findings were published in the Feb. 9 online issue of Cancer.

Testicular cancer is rare, accounting for 1 percent of cancers among American men. Still, it is the most common type of cancer for American men between the ages of 15 and 34, the study noted.

Read the complete story at usnews.com.

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