I conceived while smoking cigarettes, but apparently we had no other issues. I did find though that with an xp, we were both pot-smokers and months of trying led to zilch, the minute I quit smoking pot and DH and I started trying, bang. Sorry that doesn't answer your question, but I have heard that smoking is a big fat no-no if TTC... all those yucky chemicals floating around are sooo bad... I wish I had been able to quit prior to TTC, as I continued to smoke throughout my pregnancies
Best of luck with it, I suppose some people are just more sensitive than others to the chemicals and harm that smoking causes. I hope that a simple elimination of all the yucky stuff in your lifestyles will lead to a happy and healthy pregnancy!