Smoking

I just got my BFP this morning with #2. I had smoked for more than 10 years and used chantix to quit before we started trying for #1. I quit for 2 years and now have been smoking again for 1 year. While I will quit smoking for the health of myself and baby #2, but is it ok to have a few today? I know people who have smoked throughout their pregnancies but DH would kill me if I did and I know I wouldn't want to do that.