One's a high, the other's a low, they counter one another. Better to not smoke. Use shrooms instead if you prefer to mix. I've have my experiences and so far cannabis makes it neutral. I also know a lot of people who have experienced the same.

As for you, I'm not sure how you can roll longer after smoking but everyone is individualy different. But it'll be a neutral effect for many if not most.

The Duderino