When walking home that evening, they passed a bar.
Alcoholic: Man, I want a drink so bad...but if I drink I'll die
So they continued walking.
Eventually, they came across a cigarette on the road. They saw that it was still lighted, apparently someone had just dropped it.
Smoker: Man, I need a smoke so bad...but if I bend over and pick up that cigarette to smoke, I'll die for sure
Homo: If you bend over to pick up the cigarette, I'll die too...