I would start low for the first time, just so you can see how your body reacts and whatnot. Smoking on the comedown could revive the trip a bit, like that person said before. I know it does for me when i'm coming down from mushrooms. Last nite, I took two bong rips maybe 6 hours after eating shrooms, so I was pretty much down. But i've never felt so ripped in my life, it was crazy.