I'm going to cancel my uber because he was vaping
Why would you cancel your uber over that?
It has made him smell like flowers and I can't stand that smell.
I understand your frustration but cancelling an uber like that really hurts the driver's income. Even just leaving a bad review can hurt.
But I can't smell like vape for the rest of the day.
Remember that Uber drivers need to work on a frantic schedule in order to make a living.  If you just tell the driver that it is inappropriate to vape while you are in the car, I'm sure he will understand, and you won't have to cancel the ride.