Smoke: Don't have a clue. Must be in the shafts, shoulda weighed them before I started. I had a pile of dinged arrows I used, so maybe there are a few that arent GT's. Actually 3 of the 11 are a grain from 417, the rest are w/ in two gr of 397. Works out good, lol, as I have three that will make minimum weight for Pdox. Won't happen again, I can assure you!