depedns on how bad you're breaking it up really... small bits of bud (as in small bits of bud you'd put in your bowl) would be fine, grinding it might not be such a good idea.. it'd be way more inclined to dry out faster, possible degredation of the key ingredients, not to mention if you decide to smoke a bowl, you put joint-grade material in a pipe and you're going to burn it extremly fast.

alot of people like to assume that just becuase it burns faster doesn't mean you dont' get just as high... which isn't true... heat destroys the ingredients to a certain extent, ground up weed is easily burnt, so instead of just wasting a bit every time you put a lighter to it, you're wasting a good ammount.. no matter what you do you're going to end up burning more than you need for that hit... but if it's ground and in a pipe it's going to be burning at quite a bit higher pace then if it were little "nugs of nuggets" (suprisingly that almost makes sense when put in this context) if it were mine i wouldn't do it... but that's just me, as long as it's not a large ammount or an ammount that's goign to last you awhile (i'm goign to say 2-3 days, 4 tops) then it won't really have any negative effects, nothing worth worrying about or noticeable atleast...