I have the same issue. Though it has happened twice, new neighbours smoke in the garden and because of the weather / windows open it stinks out my house. Families with kids either side. I really don’t like the smell, it makes clothes stink (I don’t want to smell of weed in my job) and it affects the taste of food, like cigs do.
The four of them also make a lot of racket with stupid sounds and shouting with their windows open, presumably when they are high.
So I spoke to them and told them if they want to smoke to do it away from my house down the end of their garden or go to the park or something. I smell it once more, I call their landlord (I have already had to do this when they had bin bags of food and rubbish stuck outside the front of the house for 2 months) if I smell it again after that I call the police.
I’m not messing about with live and let live. It pisses me off, it is illegal and it makes my house stink. They probably think I’m a complete arsehole but do you know what, I actually don’t care, they can think whatever they like as long as the keep the noise down, don’t blow smoke into my house and don’t dump rubbish.
Your choice is sit there and take it, in which cases probably best to try to forget about it otherwise it will eat you up. Or go and have a word, and then at least you have tried to take action.
I also expect them to be gone in 6 months so I can potential cope with that.
It’s been quiet and smoke free for 2 whole days now, I think to be fair they just didn’t realise how much it smells.