vaping while ttc

not really sure where to post this but my husband and I used to be smokers about a year ago we quit and went to vaping, we quit that for a while to when we found out we had to do iui but then stress of infertility stuff and everything that was going on had us picking it up again. I'm doing an iui in a week or less and I'm so worried it's going to harm our chances. I tried quitting cold turkey but it didn't work out. anyone with similar experiences and best ways to quit? we want our baby so bad but I don't want to be the reason it doesn't work.