I need advice please help 😭

Hiya ladies so I’m 17+2 weeks pregnant today and I’m still with my current partner (father of my baby) but we’ve only been together like 6 months we’re now moving in together in our own flat (I’m on UC so his grandma had to be out guarantor) but anyway he smokes weed, like 4-5 joints a day ans I’m totally against it (especially with our baby on the way) I don’t know what to do, I’ve tried stopping him smoking it but he just won’t, I’ve tried all sorts of things to actually stop him but nothing is making him stop. I don’t want to be with someone that’s addicted to weed (he is addicted as when he goes 3+ hours without it he gets cold sweats) is there anything the authorities could help me with to keep this away from my baby? Please help I don’t know what to do? Also if I split up with h I’ll be homeless with the baby because his grandma is our guarantor

I’m in the UK 🇬🇧