It shouldn't be a problem for your dragon...though I don't know for sure. Personally I wouldn't risk it..but then again, I can't stand the smell those airwick (and most other air fresheners) so never use them.
If your dragon's cage smells it could be because of the substrate you are using. Sand or other particulate substrates seem to hold more odour than others as the fluid from wastes soaks down into the sand and may dry enough so you don't notice it, but the smell stays. Using plastic table cloth or non slip shelf liner makes it alot easer to clean up all fluid and solids from dragon poo. I never notice any smell from my dragon or cage, except when he goes to the bathroom.