Here's the story fellas:
Legally, you have to be tobacco free for 1 year to say you are tobacco free. Technically, however, they will usually ask, "have you ever used tobacco". how you answer that will depend on your rate, as Greg, "I like to Fuck George Bush" mentioned in the last post. You have to be 3-years clean to supposidly get the best rate, however, if you answer that you previously used, you most likely will not get the best rate no matter how your exam comes out.
I do not think the insurance companies cross check to see if you ever reported a tobacco positive result. I think that's inaccurate.
From my own experience, I just got approved a few months ago for a very large insurance policy at "super preferred", the highest preferred you can get. This was 12 months after my other policy was taken out at the "smokeless tobacco" rate (yes Prudential differentiates between smoking and dip they were one of the few.
I will say that when asked about use of tobacco I replied, "no".