There's a link right on this site with a lot good info: http://www.cannabis.com/usage/usage1part1.shtml

If it's prepared right, eating bud can be an incredible experience. But it also leaves some people with a "hangover."
spleafer Reviewed by spleafer on . eating raw bud dude alright so ive never eaten bud before, and so i decided to try it tonight. I snarfed a decent nug (like 3 bowls worth) an hour ago and i havent felt anything. anything i swallowed it down raw with some water.. wtf..? and its some dank stuff. smoking it im done after just 1 bowl. Rating: 5