I smoke around 1.5g per day for back/neck pain and insomnia, along with a cookie or cup of hot cocoa, usually containing 2 tsp of cannabutter. In my experience the high from eating it has a slower onset, is much more sedative and visual than smoking, and tends to last for about 4-6 hours. I often drink cocoa because a hot liquid is a particularly effective delivery system, giving a faster onset and more noticable effects. Eating a cookie/brownie or drinking a cup of cannacocoa also makes your smoke sessions go a lot farther.
My understanding is that the THC is essencially freed from its base by the liver and converted into a more potant psychoactive (anyone please feel free to correct me if I am wrong). So, eating it actually gets you higher. However, you may not notice the high at first, the same way some people dont' get high at first from smoking it. Your first few times consuming edibles you will probably A: Get high as a kite, then pass out, or B: Feel nothing, then pass out. In general, start with a small dose and work your way up until you find your comfort level.
Cannabutter:
To make cannabutter, I generally use 1/2-1 1/2 oz of bud, stem, vaporized bud, trim, shake, kief, hash, or any other bits and pieces I have sitting around in jars. I add the ganja to 4 sticks of butter in a double broiler (pyrex bowl sitting on top of a pot of boiling water). Let the better melt and the mixture simmer for a few hours. This WILL STINK. Have air freshener handy if you are worried. Finally, once the plant matter turns brown or black and the butter is DARK green strain off the plant matter through a coffee filter (I use a reusable one) into a glass jar. Cap it and put it in the fridge. Add one to two teaspoons to instant cocoa or use in any recipe.