He says when you're smoking a cigarette with someone, and you have a lighter, you should light their cigarette first. But if you have matches, you should light your cigarette first, so you breathe in the 'harmful sulfur' instead of them. He says it's the polite thing to do. He also says it's bad luck to have "three on a match." He heard that from his uncle who fought in Vietnam. Something about how three cigarettes was enough time for the enemy to know where you are. Bob says that when you're alone, and you light a cigarette, and the cigarette is only halfway lit that means someone is thinking about you.