positive air pressure then hit a negative air pressure.
Smoke is less dense than the air so by buoyancy in fluid (air) it moves upwards.
Ockham's Razor.
Smoke comes from a fire at it's base. Hot air rises so the smoke is carried upward by the heated air
Yes he does
No
there is no smoke its a steam train
Smoke is usually the result of a combustion process that releases heat. This heat warms the air containing the smoke and as warm air is lighter (less dense) than cold air, the air and smoke rises.
No Liam does not smoke the only member that does is Zayn and he is trying to quit
Yes
No zyan is the only one who does
mabey he likes it
Yes he does