I've got an Oaklahoma Joe offset smoker. I was smoking a 14lb brisket the other day and i couldn't keep the smoke going. It only smoked for about the first 2hrs then stopped. I checked the wood in the firebox and it was still good (not all burnt up). I then replaced the old wood with new ones and no smoke. What i think it might be is that for me to maintain 225 degree temp i need to totally close my intake vent. Even after i added a gasket kit to my smoker i still have to keep the intake closed (meaning i probably have leaks). But leaks or not i can't keep the smoke going. I'm used a charcoal basket filled charcoal and added 1 year old chunks of Oak. Btw, i can get 7hrs of burn time with this charcoal basket...hehehe! So, any thoughts???