Firefighters were called to the Hard Rock Hotel & Casino about 8 p.m.
The disturbance prompted the evacuation of the hotel's 18th floor, Atlantic City fire officials said.
There were no injuries, they said.
Firefighters helped Hard Rock workers clear the smoke.
Hotel security was reviewing surveillance video to see who lit the smoke bomb.
This is a developing news story.
CHECK BACK FOR UPDATES
Click here to follow Daily Voice Egg Harbor Township and receive free news updates.