I feel very strongly that you can not gain weight from smelling delicious foods. I do know that when you smell something, you are inhaling molecules of that thing (or atoms or quarks or whatever.) I know this because I went to a class on how to make flavors one time, and they use a tool to identify all the molecules in the headspace of whatever they wanted to match to come up with the flavor they were after.
But, I'm guessing the calories found in the molecules of the things you inhale are pretty negligible.
Did you gain weight after inhaling all that wonderful smelling food?
DISCLAIMER: I expect to lose this weight over the next 6 months to 5 years. I'm not going to feel like a failure if it takes an entire month to lose 1 pound. I'm going to feel like a success when that happens! I may offer advice that I'm currently not taking myself. Feel free to call me on that!