On Mar 6, 3:03*pm, "Stormin Mormon"
wrote:
Hank, they are trying to keep the cig smoke out, not make their own!

I used that as an example. Anything that can produce a little smoke
will find the problem.

Another thought that was touched on by another poster is the range
vent. When teh range vent is running, it creates a negative pressure,
thereby POSSIBLY pulling air in thru the small cracks and openings
from the wall.

For a 100% sure fix................ buy a house and not a apt./
condo. :-)

Hank