Is ashed/burned marijuana would be safe to compost for general gardening?

A customer has a question and I hope we can get some opinions on it, thanks

“I am starting a small compost pile (not to grow anything, just to reduce waste) and wondered if ashed/burned marijuana would be safe to compost for general gardening. It is an organic plant material so it seems fine, but I bet you would have more knowledge on the matter than I do. Thank you!”

It would be fine depending on quantity of ash since ash is base meaning will raise ph of compost but well blended it shouldn’t have ill effects and would help in decomposition of materials much like lime

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