Flying with cannabis? TSA's new guidance comes with a major health warning

The TSA updated medical marijuana guidelines, adding instructions to its What Can I Bring? directory for carry-ons and checked bags. Patients who use cannabis to manage qualifying conditions may travel with their medication to destination; using cannabis on board is not advised. Experts caution that traveling with cannabis should separate treatment from travel; altitude and flight can complicate effects. The American College of Cardiology notes cannabis can alter heart rhythm and raise the heart's oxygen demand, while University of Florida research shows high altitude already speeds heartbeat. The safest plan is to know the laws before you pack and avoid trying new products at 35,000 feet.