Finally quitting smoking...

I am 21 weeks an trying to quit smoking weed I have smoked for 13 years so its a little harder then I thought. At first I was still smoking becuz I was always sick lost a lot of weight when I got pregnant and the doctors were worried for the baby. We tried many different medication plus home remedies and they only thing that help was smoking weed. Well now that the morning sickness is done and I've been holding pretty much everything down I wanna quit but I feel like quitting cold turkey will actually hurt the baby more then weening myself off of it for the next couple weeks since a lot of doctors say to ween ur self slowly when smoking cigarettes. I'm hoping to be done fully by 25 weeks does this make me a bad mother? I know everyone has there own opinion and I'll probably get a lot of negative remarks on this.