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Most of these letter writers are missing the point completely, the Smart is not a 1-1 replacement for your current car, it is something else entirely and for many people it is a second/alternate use vehicle, often replacing a larger second car.
Here is Vancouver there are literally thousands and thousands of Smart cars and more than anything else the reason is PARKING PARKING PARKING, I often leave my Mazda3 at home and take the bus downtown to avoid the parking hell, Smart cars don't have that problem.