Is there a limit to how much one can smoke?

So, I was walking home from work this afternoon. I stop at the lights at 12th Ave. and there's this guy standing on the corner with a big bag of cigarette tubes. Once I got looking again there were TWENTY boxes of tubes (is there 200 in each?), two huge packets (sleeves?) of tobacco and a Costco sized box of chewing gum. How strange. He finished a cigarette just as I approached the corner, and before the Walking Man lit up to tell us to go, he had lit up another cigarette. I wonder how much he smokes a day? How many pieces of chewing gum does he chew a day to keep his throat moist and lower the pain? How many people smoke this much anymore? Insane.