I do, but I have had one since high school. I was lucky enough for my parents to pay for my gas, which was the initial reason they gave me the card (which links directly to the family account, not my own). When I moved to school, I set up an account with a different bank because our home bank doesn’t have branches in the city, and I got a debit/ATM card with that, which I only use to withdraw cash. Most of my friends have some form of card; its too difficult to just have cash all the time. Especially with being able to buy things online (textbooks from amazon.com, for example), it seems to be more important to have a card. Perhaps that’s also just more common because I’m living in NYC, I’m not sure.