Air Purifiers

just yesterday I let my 2 cats out for a breath of fresh air. Before I could see what happened a local possum who had been roaming the apartment complex was walking along the way when my oldest cat (6yrs) natural hunter jumped up to quickly confront the possum. I saw the whole thing and the only thing that happened was my cat quickly clawed the possum who saw me to quickly proceed to be very nervous and break up the whole thing very quickly. the possum didnt react what so ever but my cat did bat her one good time on the side of the face area. The only thing I could think of was to apply watterless hand sanitizer using toilet parer on her claws very quickly. Does anyone know if this quick encounter should be concern for rabbies scare? I know that possoms supposedly arnet big carriers for rabbies but about a few months earlier there was a huge raccon roaming the premises which was suddenly replaced by this possum a few months later with no sign of the racoon anymore.
the possum was acting normal except for the fact that I was right up on them to distract any prolonged confrontation but the possum showed no fear whatsoever it was almost like me and my cat who was confronting it were not even there is this normal?

The new neighbor just moved in downstairs. He apparently has been smoking in his apartment, which is filtering up to my apartment. I don’t think there is anything in our lease saying we can’t smoke in our apartments, and we don’t want to have to say anything unless it becomes a huge problem. We’re going to go ahead and try the air purifier thing and if it doesn’t help then we might have to go and ask him to stop smoking in his place or at least try to do it out the window…but I understand that may not go over too well. So which brand should I look for when purchasing a purifier?
Ok, we just found on our lease that smoking is not allowed on the premises, so maybe we won’t need that purifier after all…thanks for the input!