If you are found to be eligible to take part in this study, you will be randomly assigned (as in the toss of a coin) to receive erlotinib at either the standard dose or the high dose. There is an equal chance of being assigned to either group. If you are assigned to the high dose group and you are a current smoker, you will receive an even higher daily dose of erlotinib. Both you and your study doctor will know which group you are in.