Thanks for all the feedback, We are here and are "smoked out" regularly!
The Landlord knows, don't think he would want to change anything, he knows the people upstairs are "smokers" they were down here smokers first.
We bought 3 Windchaser Ionic Air Purifiers and some electrostatic duct filters, the purifies seem to clean out the air throughout the night and during the day when there is no active smoke coming through. When they are home and smoking, the residual smell still comes through the air ducts. The duct work is connected in this home. So I close the vents, then its really cold. So we will buy some type of room heater.
We are also going to try the Hepa filter in the duct work, but there is no way to stop the smoke from coming in when the heat blows.
Also looking into a bigger better more powerful ion air purifier when we have the funds.
My lips tingle when the smoke starts to come, so I know to close the vents! fun!
Its a nice home, except for the smoke. I will never again rent a duplex with a smoker or move into a place that had smokers. This place will just be for a time.
Thanks again! for all your suggestions here and on all the other smoking threads.