After smoking marijuana, users commonly describe the effects as sedative or relaxing. There remains no known association between heart disease and marijuana consumption, but patients should know the possible risks. However, scientists understand one way marijuana affects common heart conditions, which might give cardiovascular patients pause. Photo by rud0070 via Pixabay Observational studies have caused some scientists to compare the cardiovascular risk of smoking cigarettes to that of smoking weed. Until we know more, scientists cautioned heart patients to limit use when possible and talk to your doctor, so they can advise about how much you’re using and what delivery method you’re using.