Does marijuana negate the effects of Vyvanse?

I do, and so far so good, I would like to know if it has any interactions, though, I am not being very smart about it for not knowing first. IMHO, I think the Vyvanse is bad for an adult if used long term, I think it would have to start messing with the ole ticker. If you had to give one of the two up, I would quit the Vyvanse. There are about 1,000 years of history with the other, not so much, for this here cocktail of God knows what. However, no doctor will tell you that, they seem to all personally benefit from specifying brands. I bet a lot of them go home to a little bag of sunshine every night and never touch any other meds...