One of the greatest comebacks in professional football has come to an end, as Quarterback, Alex Smith, has officially retired from the NFL. Smith came into the pros with lofty expectations, and how could that not be the case when you are a Quarterback who was taken first overall? From Utah, it was the San Francisco 49ers who chose him in 2005, but it was a mixed bag of success, as he struggled on the field and with injuries. Missing the 2008 season due to shoulder issues, Smith had to fight to get his job back in 2009, but again, he…