Myself and pretty much anyone who's visited my house this week has noticed a really pungent smell like someone smoking a reefer (used to do it as a student so know the smell!). Didn;t think much of it until l1st night until I went into my bathroom at about 9pm and got knocked sideways by the smell! Then I opened my airing cupboard which presumale adjoins neighbouring airing cupboard and it smelled really strong. I might have been imagining it but I think I started to feel the effects, I was very chilled out when DH left his contact lenses on the sink instead of binning them which usually winds me up.
My neighbour lives alone and is in his late 50s/early 60s. His garden is used as an allotment so he definitely has the growing know-how. I think he might have a weed farm.