Help no hate

Hey ladies, I don't want any negativity. I'm 5 weeks 2 days, and having my second child, with my first I had a placental abruption and I'm terrified that it will happen again. My problem? I'm having a hard time quitting smoking, I believe thy was partially the cause for my first (and injury during strenuous work) and being 1 in 25 chance it happening again I want to eliminate everything that I can from it happening again... Any tips???