Marijuana Ingredient May Reduce Tumors: Study Shows

London — The active ingredient in marijuana appears to reduce tumor growth, according to a Spanish study published on Wednesday. The researchers showed giving THC to mice with cancer decreased tumor growth and killed cells off in a process called autophagy.

“Our findings support that safe, therapeutically efficacious doses of THC may be reached in cancer patients,” Guillermo Velasco of Complutense University in Madrid and colleagues reported in the Journal of Clinical Investigation.

The findings add to mixed evidence about the effects of marijuana on human health. Studies have suggested the drug can raise a person’s risk of heart attack or stroke and cause cancer.

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