Smoking a pork shoulder takes 12 hours. Does it matter when you put in the wood chips. Lets say I start smoking the pork around 12 right before I go to sleep and i put in some wood chips to start it off. and I put in more chips when I wake up after 7 and every hour after that. Does it make a difference whether I put in wood chips the first 5 or 6 hours or do you get the smoky taste as long as you use the chips.