Meh. My dad worked as a delivery driver. He loved driving (his idea of looking after the kids was to put you in the back of the car and drive to nowhere in particular while you got horribly car-sick), and it did him no good at all (pretty sure all that sitting stationary while breathing in fumes contributed to his severe health problems for most of the last part of his life).
What I do know is everywhere I try to go, whether on foot, cycling, or even by bus, there are vast numbers of cars in the way, often near-stationary, or entirely stationary, given the way roads and pavements alike are often nearly completely blocked with parked cars, that are inexplicably allowed to park on roads clearly too narrow for them. All cars do in the city is get in everybody's way. If you live in the back-of-beyond (or in a badly-designed country like the US) maybe they are necessary, but in a city they serve very little useful purpose.