That's a great question.
We're still learning. We probably know much more about its effects on the brain. We do know that many of the components in tobacco are also in cannabis, including some potential carcinogens. That's why I like hearing this discussion about alternatives to smoking. We can isolate the therapeutic components to truly understand that and get rid of some of those that are potentially harmful.
As has been said, we still have a lot to learn to understand the effects of cannabis, which is a mixture, on the body.