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I used to burn incense around my tanks all the time. I never had any problems. Scented oil burners and candles have never given me trouble either. Just be careful with any air freshener sprays, etc.
I would say try not to keep it too close to the tank, but I burn stuff as well (incense, candles) and I haven't had any problems yet. Ciggarette and cigar smoke = nasty and not good for anything IMO but I'm not a smoker lol