there's no disadvantange to breaking up weed. I break it up pretty small, almost to a powder you would want for your joints. basically i do this because i have this crazy idea that when i do this it allows every bit of grass to fully burn because it's so small, also this powder smokes so much! just a little powder packed onto the screen of my bowl with fill my water pipes chamber and cost me a damn lung. and last because it seems to save more, rather than packing a nug