Cite?
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.