I think the cardiovascular exercise would be beneficial. Exercise helps improve your cardiovascular fitness, beneficially exercises the heart and lungs, improve your vital (lung) capacity, keep your lungs clear, and helps keep your veins and arteries in good shape. It just does tremendous things for both your body and psyche. Even as a cananbis smoker, it'd still be beneficial, I'm sure. But you're right that you likely won't find any research on this. Unless someone's researching it in another country, that is. There likely aren't research studies being done on the specific cannabis-exercise combination, at least not in America. But we do know that cardiovascular exercise has lots of benefits.