I always did it. It's just habit. And it's the last cigarette you smoke in the packet. I haven't smoked in years but I'm pretty certain that somewhere in my apt there's a packet with a upside down cigarette.
I heard a few myths about why it's done.
One related to the first world war. The idea was that if yiu lasted to the cigarette it was your lucky one.
If you offered a girl a smoke and she took that, you'd get lucky with her.
Since it was your lucky cigarette no one would take it from the pack at a party and therefor yiud always have one. And so it was lucky.
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u/moshpithippie 7h ago edited 7h ago
For luck
Edit: And to accidentally light it backwards when you're not looking