they also chain smoke so much that i swear i can smell it though the wall!
Because you share the same air, I am sure you do smell the smoke.
Get a big dog. Post signs about and say stay off.
I got the worse fucken neighbours on the fucken ass planet especially the lazy, pot head, piece of shit cunt across the street with trhee shitty fucked in the head kids. The bitch has an easy life, doesn't work, bitches at everyone including her husband who does everything for this worthless lazy slimy cunt. She's worthless and worse yet the goddamn CUNT owes me fucken money. I hate her shit eaten guts.
I think you should move. Or send over cookies with an ingredient to make them sleep for a long, long time. Stop lending them money. Sue them if you can.