Can cannabis affect the qt interval of the heart?

Yes, cannabis can affect the QT interval of the heart. Some studies suggest that cannabinoids may lead to changes in cardiac repolarization, potentially prolonging the QT interval. This prolongation can increase the risk of arrhythmias, although the clinical significance and extent of this effect can vary among individuals. It's important for those with pre-existing heart conditions to consult with a healthcare professional regarding cannabis use.