Yes, I always sandwich spirits with my cannabis. Haven't used LSD since January, in addition haven't used any other drugs for at least a decade(besides mxe around jan). I'm just surprised how little information exist about these occurrences.

What little information there is, you'll find here.

I think a lot of people might dismiss these kinds of occurrences as some kind of random electrochemical side effect... But if we could gather more info I bet we'd find a pattern. Try searching "dmt flashbacks" at the nexus and see what you find...