I doubt vaping has the health consequences that cigs do. Baking the plant at a precise temperature needed to just release the desired chemicals instead of burning it and releasing all toxins presumably would result in less cancer. Cigs also have filters that attempt (and fail) to trap the unwanted chemicals and iirc there’s also some recent research that the filters themselves have some negative health consequences (for both the smoker and for the environment when the discarded filter chemicals leech into the ground water).
Note I’ve not studied this in depth but that’s my off-the-cuff understanding.
This actually happened to me: I arrived at my destination and discovered my load was loose, ready to fall. There have also been times that I dropped something. And times that my backpack was mistakenly unzipped and I could have lost something worth keeping.
So if I operate with your assumption (that honking drivers are always assholes), then I lose the opportunity to pick up something I dropped or correct insecure cargo. Why should I give that up?
(edit) Since a horn is an ambiguous signal, in this circumstance of a car following a cyclist it should come to be universally understood to mean a cyclist dropped their phone or wallet, as this is the legit scenario.