That smoking part you talk about...... you are showing your age. I remember smoking flights. I doubt a cigarette ever put put down an airplane. Stupid things like oxygen canisters going off in the cargo area, or faulty capton wiring were the culprits here. The seatbelt thing? Really? Just think. You land going 150 MPH and suddenly you slam into a wall. If you got your seatbelt on, you get instantly cut in two. Your intesines would all come out your mouth, and the other half from somewhere else. I can see putting them on during turbulence like if you slam into some tough windshear that suddenly drops the plane down real fast.
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