well it's a tryptamine, and in my experience even though some people seem to think it isn't and Maoi inhibitor.
I've done a high dose of St Johns Wort with mushrooms before and has visuals so thick i couldn't find my way out of my apartment.
I don't know too much about Dagga. But... it stands to reason... there could be something in there that allows the natural spirit of the plant to potentate the effects of a lysergic tryptamine.