Firehawk

Hey all, I've been thinking about this for a little while, and my searching around has brought me here. This seems like a great forum! If I were able to teleport, what would happen if I teleported to a higher elevation? For instance, I live near sea level (around 400 feet above sea level), what would happen if I teleported to a mountain at 10,000 feet? Would I experience the bends or something similar? On that matter, how quickly are you able to safely ascend to higher elevations?