Cigarettes and Tampons

A man walks into a pharmacy and wanders up and down the aisles.
The sales girl notices him and asks him if she can help him. He answers that he is looking for a box of tampons for his wife. She points him to the correct aisle.
A few minutes later, he deposits a huge bag of cotton balls and a ball of string on the counter.
She says, confused, "Sir, I thought you were looking for some tampons for your wife?"
He answers, " You see, it's like this. Yesterday, I sent my wife to the store to get me a carton of cigarettes. She came back with a tin of tobacco and some rolling papers saying, 'It's sooo much cheaper!' So, I figure if I have to roll my own. So does she."