My point is that most people don't consider externalities when deciding on their transit. Sitting in your car is far more comfortable than navigating smelly and

My point is that most people don't consider externalities when deciding on their transit. Sitting in your car is far more comfortable than navigating smelly and dirty transit with unstable individuals roaming. Yes transit is safer, but people really don't do that calculus on the morning of their commute. Weed smell is going to be a problem simply from the fact that users stink ALL THE TIME, even if they aren't smoking in the actual metro. It like an epidemic of BO. What Costco do you shop where you are pressed up against people for half an hour? A loaded train is a sealed environment with poor ventilation and way more density than almost any other scenario in modern life. Regardless it's also people's perception, and a huge warehouse feels better ventilated than a subway car.