Someone told you wrong... The psychoactive chemicals in marijuana must be heated to a certain temp. in order to bind to the lipids in your body or the fats in whatever you are cooking. Eating, snorting, raw cannabis... it just doesn't work.
Take that keif and sprinkle it on a peanut butter cracker and pop it in the toaster oven until the peanut butter as consumed the keif... let it cool and eat it, it will give you a really different, but awesome, high.