I agree completely with "domers." I know you're not planning to die -- no one does unless they commit suicide -- but if you die within the first two years of the policy, the insurer will probably find out from your personal physician that you used to be a smoker. If the application asks whether you have "ever" smoked, or if you've smoked within the past year or so, and you lie, the insurer WILL rescind the policy. Your beneficiary will receive nothing and the premiums paid will go to your estate.
Long after the cotinine (the by-product of nicotine) disappears from your blood and urine, the effects of your years of smoking does increase your mortality rate. A higher premium is fair, given what your body has gone through.
So don't chance it. Fess up to being an ex-smoker, pay the higher rate and after you're smoke-free for whatever period of time the company requires, ask for a premium reduction.
Former life insurance underwriter; 9+ years insurance law experience.