Sorry this didn't get answered earlier but hopefully this will help in the future. Yes you can cut it in half if that's what you want to do. You would smoke it at the same temp as before I do them at 225-250 your smoke time would be figured for a 7 lb brisket not one 14 lb one. Cutting it in half reduces the cook time as opposed to it being one bigger piece. No matter how much meat you put in the smoker it is figured by each piece of meat NOT the total amount of meat. So if you had two 7 lb briskets and a 10 lb brisket and a 9 lb butt each piece of meat would smoke at the normal temp you would smoke one at and time would vary for each piece. Your overall smoke time will be slightly longer than doing one 7 lb brisket but not enough to really notice. You would check temp on each piece of meat as they will all finish at different times. If you put two 7 lb briskets in the smoker side by side they would finish at different times as no two pieces of meat are identical that's why we cook to temp not time. Differences being differing amounts of fat, meat fiber toughness, collagen etc. Times are just estimates of about how long the smoke will take and the only thing we really smoke by time is ribs the rest is done when the internal temp is right not the time.