Help! We have quite recently had new neighbours move in next door to us. We live in a semi and they are attached to our house. They are Turkish and smoke very strong cigarettes. Unfortunately the smoke is somehow coming in through the wall into my 7yr old daughters bedroom. I have no idea how it is coming in, we've not had this problem before! I have bought an air purifier which helps but other than that I am at a loss as to what to do. Any ideas?