Ban duty free? You're clearly not a driver.
Getting my hands on a nice bottle of scotch at a reasonable price is one of the few things that still puts a smile on my face these days. I'll be loading up today before departing these shores.
If Airlines were worried about the weight and increased fuel burn, they would self regulate. it's not the job of government to reduce airlines fuel burn. Maybe a better solution would be to not allow anyone who is classified as obese to board the aircraft....but that would kill the already struggling US industry.