Why do some relations squeeze the filter on ther cigerettes?

Why do some relations squeeze the filter on ther cigerettes?
Nerves I suppose. My bff does that and twists them at the same time...drives me nuts.
let more tar surrounded by!
its a habit that date back to the TV show The Rifleman
because that make the cigarette non lethal
in good health, scientific point is -
ciggerette is just close to a pipe with tobaco and filter...
if you sucking through pipe and the channel becomes tight - the atmosphere will be sucked faster..
same is the case near the squeeze of filter of ciggerettes...
you squezze it - the opening become smaller.. u suck / inhale the ciggerette - and air get sucked faster with more force...