UNBC professor’s study links pot and testicular cancer

Cannabis use may facilitate later onset of testicular cancer

A new research from a University of Northern British Columbia professor has found that use of marijuana is associated with the development of testicular cancer.

As part of a retrospective study, Northern Medical Program professor Dr. Russ Callaghan and his team looked at data from young men conscripted for military service in Sweden in 1969 and 1970, and tracked their health conditions over the following 42 years.

They found that heavy cannabis use (defined as more than 50 times in a lifetime, as measured at conscription) was associated with a 2.5-fold increased risk of developing testicular cancer.

“At this time, surprisingly little is known about the impacts of cannabis on the development of cancer in humans,” said Dr. Callaghan. “With Canada and other countries currently experimenting with the decriminalization or legalization of recreational cannabis use, it is critically important to understand the potential harms of this type of substance use.”

The results from the recent study, as well as three prior case-control studies in this area, suggest that cannabis use may facilitate later onset of testicular cancer.

“Our study is the first longitudinal study showing that cannabis use, as measured in late adolescence, is significantly associated with the subsequent development of testicular cancer,” adds Dr. Callaghan. “My hope is that these findings will help medical professionals, public health officials and cannabis users to more accurately assess the possible risks and benefits of cannabis use.”

The project included an international team of researchers from Karolinska University in Sweden and the Division of Cancer Epidemiology and Genetics at the National Cancer Institute in the U.S.

The federal government hopes to legalize marijuana in Canada by July of 2018.

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