"John Cartmell" wrote in message

My daughter has recently moved into a 1930s semi and, after a few weeks,
is
finding that one of the bedrooms smells strongly of tobacco smoke in the
mornings. No one in the house smokes and it's presumed that it's coming
from
next door.

My mum had a similar problem in a 2nd floor flat. Turned out that all the
service pipes/cables went up & down in one corner and were boxed in badly
with plasterboard. It was sealed with silicone and solved the problem.

I reckon there is a pathway between the bedroom & next door, maybe in the
loft or under the floor.

Dave