Anyone have any recommendation(s) for in-unit cigarette/marijuana "smoke" detectors? Our smokers got mad at us for making them share common areas with non-smokers (who also got mad because of the smokers), so now we have 10 residents threatening to smoke inside their units. We've decided to install smoking detectors in all units, but since this is our first time I thought I'd see if anyone had any recommendations. Thanks in advance!!