Help- new mom

Harley

I’m 5 weeks pregnant, we just found out on Wednesday. I was told for years, due to my PCOS I wouldn’t be able to conceive again. I vape and I want to quit because I don’t want to hurt my baby, but I read that quitting cold turkey can cause miscarriage. I want to do whatever I can to keep this baby healthy and happy. Does anyone know what I can do to start?