Got a Masterbuilt MB20077618 Analog Electric Smoker with 2 Smoking Racks, 30 inch, Black for fathers day. Have smoked it it 4 times now but dont get a lot of smoke.Other smokers i have seen have vents in top and bottom should I put some in? Also last time I smoked I left lid off chip box seemed to smoke more. Any help would be appreciated !THANKS