This is an interesting question, i personally actually smoke an unfiltered colombian brand called "piel roja", i'd think they'd smoke the same, but i rarely when i drawing my characters smoking draw unfiltered ciggies.
This is just because a cigarette without a filter is just less recognizable, i want to make it clean they're smoking tabbaco and not something else.

So i'm not sure wich filtered ciggy brand they're smoeking lol

Sad to say i don't see it lol, but if i accidentally drew an amogus somewhere that'd be funny