Smoking.

I'm currently 25 weeks and 3 days.... I've always been a heavy smoker since I was on my own at the age of 13. When I first got pregnant of course I was honest with the doctors and told them it would be in my system. And they told me even if I couldn't stop fully to keep it at a minimum. I did, but then I got to the point in my pregnancy I couldn't keep anything down not even water. Went to the hospital of course... I stopped smoking for like two weeks in November then smoked at 19 ish weeks and some days (just one blunt) and hit one again on the 2 of December. Had been cleaning my system since. Now I smoked at the beginning of the year. Will I still be able to clean my system out naturally before baby gets here