You may notice it the most when you come home from a restaurant or bar and your clothes don’t smell of smoke. Or, maybe it’s when you do get a whiff of cigarette smoke that you realize your nose is more sensitive to it. If you’re a smoker, though, you note the disappearance of cigarette smoking by how many fewer places allow you to light up.

But here’s where scientists have noticed the decline of smoking in the United States: cancer death rates.