A young couple had been married for a couple of weeks, and the man was always after his wife to quit smoking.
One afternoon, she lit up after some lovemaking, and he said, "You really ought to quit."
She, getting tired of his nagging, said, "I really enjoy a good cigarette after sex."
He replied, "But they stunt your growth."
She asked if he ever smoked, and he replied that he never had.
Smiling and lowering her gaze to his groin, she said, "So, what's your excuse?"