My first BA upgrade was from ET to CE FRA-LHR, possibly a Tristar. My 'upgraded' seat was in the middle of row 9, the only smokers' row.

It was dire.
LH (= Lufthansa) had a curious solution on single aisle planes: smokers on the right and non-smokers on the left.

(Or was it the other way round?)
Flying from Dhahran to Bahrain on GF before the causeway was opened - IIRC scheduled flight time was 40 minutes but wheelsup to touchdown was about 20 minutes - I swear every passenger but one lit up. Oh, and I have never seen such short skirts worn by cabin crew, but that's another matter.
Some things in aviation have improved beyond measure.