Backflow incense has gained popularity in recent years. It sort of defeats the purpose to have the smoke go down, but whatever. It requires specially shaped backflow cones & a holder with a channel for the smoke. Imagine backflow incense coming out the rear end of a starship.
The lion kingdom's original idea of an incense stick inside a starship never took off. The trick is a clamp which keeps the stick in a vertical orientation. The stick could then fit inside a starship enclosure or cutaway.