Update: Spoke to the neighbour about the smell of weed. Never got the reaction I expected, guy was a bit of a dick went in a mood but sealed up all his floorboards his end.
HOWEVER at 10pm every night I can still smell it in one of the rooms really strong. Like a stale weed smell not like it's being smoked. Woke up at 3am this morning for the toilet and heard a loud vibrating noise. The cunt is growing it I'm certain of it in the loft. I live in a terrace so it's shared lofts in the connecting 4 houses. The fact I can smell it so strong is fucking me off and his reaction. However shitting it as well as I'm living next door to someone who grows weed who looks shady as fuck.
Firstly the smell is pissing me off but least I know how it's getting in now. The divide in the loft between me and him is a brick wall with loads of holes in the bricks. If I seal the bricks with expanding foam will that stop the smell drifting through??
Secondly how safe is it from fires the fact he is growing this in a loft??
Option 1) I get rid of the smell by sealing the holes in the loft and say nothing (preferred option)
Option 2) The smell doesn't go and the risk of fire is high. His landlord is his best friend who I guess must have a clue what's going on. I tell the landlord. Risk landlord telling neighbour I mentioned this making life difficult for me.
Option 3) I call the cops....however he will know it's me as I'm his only neighbour as he is the end house and I've mentioned the weed smell before. Don't want to do this at all.