The study found people who used cannabis chronically - including in edible form - had significantly reduced vascular function.

The marijuana smokers showed changes in their blood serum that proved harmful to endothelial cells, which form the inner lining of blood and lymphatic vessels. Those who took THC edibles did not show changes in their blood serum.

UCSF study finds chronic cannabis use, whether smoked or ingested, reduces blood vessel function, increasing heart risks.