Heavy cannabis use could pose this threat to the brain / Researchers conducted the largest ever study on the impact of cannabis on brain function. Here's what they found / Growing demand for stronger marijuana highlights the risk of cannabis-induced psychiatric disorders / Study finds link between marijuana use and cardiovascular disease / Study shows marijuana has been linked to chance of heart attack and stroke / Smoking cannabis linked to increased risk of heart attack, stroke / Higher rates of psychosis and other disorders linked to marijuana use, study finds / 'Marijuana Moms' take on prosecutor 'Dad' in controversy over mental health effects of cannabis