Because when you're using it on the down low, i.e. parents or roommates who don't necessarily approve of it or even really close neighbours, it smells your entire kitchen/house up! lol

You have to heat up the weed up if you want to get the maximum effects of it - you have to carboxylize the THC - before you cook it. They usually recommend heating it up in your oven.

I've looked this shizz up. I would rather eat it too :P but discreteness won't allow me