A young woman walks into a laboratory. Over the past two years, she has transformed almost every aspect of her life. She has quit smoking, run a marathon, and been promoted at work. The patterns inside her brain, neurologists discover, have fundamentally changed. Marketers at Procter & Gamble study videos of people making their beds. They are desperately trying to figure out how to sell a new product called Febreze, on track to be one of the biggest...

Discusses addiction to cigarettes, how it is encouraged by advertising, the physiological damage it can cause, reasons to avoid starting, and ways to quit.