Interesting topic. I once watched a weird science experiment on TV to test how many chocolate liqueurs it took to be over the drink drive limit. From what I recall it was over 150. With triggers to drink whether that be taste or smell everyone is different so it is down to personal choice.
Alcohol burns very easily with heat so alcohol in hot food will not get you drunk. Funny enough I had Chicken Chasseur ffrom a jar for tea. The alcohol had been burnt off but there was a lingering smell of red wine. This did not trigger me but evryone is different.
You also mention mouthwash. It is quite surprising where you can get alcohol - cough medicine and toothpaste. Even if you allow a bananna to ripen too much alcohol will be produced!