If smoking is the cause of so many deadly illnesses, why are they still selling them?

Selling tobacco: People often do not do what is healthy, and once the start, many enjoy and later become addicted. Nicotine like caffeine are stimulants, give people energy, people like how the feel when they smoke, or drink coffee. Soaking is far more dangerous, and more addictive. This is an adult decision and we are a "free-choice" society, unless it hurts others which smoking does! ?