When you need to smoke, please do NOT do this in your bathroom. Someone has just been doing this and now my entire place smells of sigaret because I had the MVHR/ventilation on for some time.
As you might know, the ventilation in the bathroom sucks the air in as opposed to the other vents in the property which blow out air.
I have a newborn baby here who is now breathing in this smell, so PLEASE do not do this in the future!!