I think you should read phlux-'s and my posts in this thread as we both commented on smoking residual d-limonene that was in our hash oil (i gave a rather long-winded opinion in the "some thoughts" section of the post that was literally right before yours). I think you shouldn't do it, it's a waste of bud and there's no evidence (or at least I haven't seen any) that smoked terpinoids from limonene will potentiate your cannabis high.

SB