just put in as much weed as you would normally smoke. it's effective, but when i eat weed i usually get a slightly different high than if i smoked. eating it makes me feel kinda drunk/high. like more of a body high than a head high. it also takes longer to get stoned if you eat it, but i think it's worth it i actually prefer to eat weed in chocolate, brownies, cookies etc., than to smoke it. as far as i know, it's safe.