Nicotine and fertility?

I was a smoker for five years before I quit and got on a vaporizer e cig. I have two children who we conceived quickly and without problems. We are now ttc #3 and I have had one chemical and many bfn. I also have an anxiety disorder so I smoke on my vaporizer more than I should .I am wondering if the amount of nicotine I am consuming could be messing with my cycles and my fertility. Anyone have any insight on this?