Let me tell you about a patient—we'll call her Judith—that I met in the emergency department. She was a smoker of 30 years and her lung disease was so bad she couldn't leave her house to walk past her letterbox. He lips were blue. She had come into hospital because she had caught whatever viral infection was going around that winter. I could see her scarred lungs on the X-ray behind her. In fact, there was barely any of her lungs left at all after smoking for so long. Of course she knew her continued smoking would kill her, and she knew her habit was taking a chunk out of her pension, and it was robbing her of time with her beloved grandchildren. She had every reason in the world to quit but she couldn't because tobacco is one of the most harmful and addictive substances in the world.