When I found out my kids were coming to visit I had to find a way to make my house smell smoke free but, I don't like the room freshners. After giving it much thought I decided to try a dryer sheet in my heater vents, you can control the amount of freshner by the size of the sheet you put in it. My daughter-in-law was completely amazed by the whole house freshness. Joannie even sent me a note thanking me for all the effort I must have put into the extra cleaning I must have had to do.