You decide you want to go back to your old level of consumption (or more) and continue to gradually damage your mouth, body and mind, or you decide that you really enjoy withdrawal and you want to make it last forever
If the smoking status is already documented, it can be asked: I see from your notes that youre a smoker, are you still smoking? If they are recorded as ex-smokers, it is vital to re-check as approximately 70% of ex-smokers will eventually relapse within a few years, further questions that can be used are: According to your records you quit smoking, how are you getting on with that? When advising it is important to take the perspective of educating not judging or coercing, for example: Ok, I am not sure whether you are aware, but there are several negative consequences to you and your baby of smoking during pregnancy, and it is entirely your choice, but we know that the best way to stop is with extra support, which is available in the NHS
Hanley JA: A heuristic approach to the formulas for population attributable fraction
Quitting tobacco use at any age can reduce the risk of getting or dying from cancer