I've had some amazing experiences with cannabis and Aya, lots of very earthy communications. I absolutely needed to be outside, and every time it was engaged, it was engaged intentionally...
I think the only real issue of concern is to be extremely mindful that harmalas DO potentiate and intensify the cannabis experience... so don't smoke enough to time travel if you aren't prepared to wet your pants.

Cannabis post-Aya can also bring back strong feelings of Ayahuasca, so just don't take it lightly, and be prepared! Once in a while, I find it very nice and productive. Great for processing a lot of content of a previously intense journey. So so beautiful if you can make it outside into the forest.

Some things will come easy, some will be a test