What determines the cherry on a cigar?

Ive smoked some sticks where the cherry is flat, where the cherry is somewhat inverted, others where the cherry is round and still others where its a perfect cone?

Is it the tobacco used, how its rolled, wrapper? All the above, none of the above?

I notice when I am really burning through a gar it has more of a convex cherry

The humidity

The roll/bunch

Type of tobacco

Outside factor/weather

Humidity affects overall burn, the bunch or how its rolled plays a smaller part, type of tobacco like ligero which burns slower, if your smoking in high wind and or snow/rain you'll have issues.

P.S. I loved the conehead skit.

Yep, its a classic. Got to love Jane Curtain " Jane you ignorant slut"

Cigar pros cigars smoke always with a perfect cone, which is not seen because of the perfect ash that holds all the way to the nub!