Here are the truths of what is known and what research has provided in an updated analysis of cannabis and the risk for cardiovascular effects. While some studies have linked the chemicals of cannabis to a risk for heart attack, much remains unknown about THC’s effects on the cardiovascular system. Truth: The risk appears to depend on the delivery of cannabis Cannabis is known to raise the heart rate and create a temporary rise in how fast the heart pumps. With removal in the works, individuals and care teams can become better informed about the role cannabis plays in the human body and the heart.  The public needs high-quality information about cannabis, which can help counterbalance the proliferation of rumor and false claims about the health effects of cannabis products.