The incident happened at the Star Market on Seventh Street Tuesday night.
The suspect entered the store around 6:45 p.m. and asked to buy a single cigarette.
When the clerk said he couldn't sell just one cigarette, the man pulled out a gun.
The clerk then reached down and pulled out his own gun. The man backed out the door in a hurry, firing one shot through the store's front glass as he fled.
The suspect fled in a black sedan.
No one was injured.