"Quit or Die" or use harm reduction?

Jim quit smoking when he was in his 30's after receiving a diagnosis of Chronic Obstructive Pulmunary Disease (COPD). He took his doctor's advice and switched from smoking cigarettes to using smokeless tobacco or "chew". Thirty years later Jim is in my Stop Smoking, Stay Quit class to stop his nicotine addiction to smokeless tobacco.

This is an example of "harm reduction". The premise is that