Charcoal briquette BBQ’s are no longer permitted on combustible balconies or within 10ft of combustible construction. The exception to that rule is when buildings, balconies or decks are protected by an automatic sprinkler system.
Propane tanks, five gallon or smaller are permitted. A smoker would fall under the same requirements as the charcoal briquette BBQ. With all this said, the apartment owner does have the final say and they may have their own policy regarding BBQ’s and grills on balconies.