Cite?
Smoke?
All kidding aside, in case there was some question, the "90 percent" refers to this:
Most small-use marijuana stops are winos and thugs, rather than white-knuckled, principled, Ron Paul-ites who talk about Ayn Rand, who are scarce in NYC.
. . . That proportion is empirically derived, and if you live or work in NYC, obvious.
I used to live in NYC. My wife used to work around the corner from Wall Street.
We would talk about how Wall Street stunk like marijuana at 4-5pm on Fridays. One of her co-workers used to remark how much business the pot delivery people had in that area of the city & how much time they spent at/in office buildings.
Perhaps your knowledge of who all smokes marijuana in NYC is...limited.