My mum lives in a terraced house and upstairs in Dsis's bedroom and the bathroom always reeks of next door's cannabis plants. Mum thinks they are growing in the loft space. Sometimes the smell comes in the kitchen downstairs too. This morning I could smell them outside on the street. It is really getting her down and she wants to report them to the police but is worried about causing ill feeling with the neighbours as they are a bit skanky. WWYD?