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A correctly sized unit needs 2040 minutes to perform 45 full air changes before cigarette odor drops below the human detection threshold (~3 g/m nicotine)

If it's like some of the slime or harbor freight ones I've taken apart, the motor has brushes that wipe an armature and if this area gets dusty or dirty, the resistance goes up

however, potential concerns raised in other literature include the unknown safety and toxicity of their components and aerosols, 14,15 and poisoning in children who mishandle nicotine cartridges

If you're familiar with the salt solution method, that works wonders too in keeping a System pipe tasting clean