what i noticed i was doing with some of my lighters is when i am at the final light stage of the cigar and i "puff" i was holding the lighter close enough to the flame that smoke would go back and hit the burner. after time, this would gum it up. hold the lighter farther away or at a different angle to help keep it from gumming up.
You can also try using butane. The pressure from the butane bottle is more powerful than compressed air. You waste a little butane but it may dislodge some stuff that compressed air won't.
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