Disney most likely has run the numbers of what it was going to cost them to alienate a small percentage of their visitors vs. encouraging non smokers to put Disney down on their bucket list. They have obviously decided that getting rid of smoking areas, ice, and wagons won't impact their bottom line and since the vast majority of people are non-smokers, may even enhance it with more people wanting to come to Disney if it is designated as "smoke-free."
-A former smoker.
Or, some Millennium child who has been over-promoted and has anti-smoking prejudice has made a decision that does not reflect the customer base requirements. I actually believe that this decision has been promoted by someone who hasn't a clue about how it will impact on park operations.