looking at the multivits today i saw that the above mentioned clearly state on the back of the packet under warning - 'Not to be taken by smokers'

now i'm a non-smoker and i also know that ideally you stop smoking before TTC but why this statement? Is this some weird nanny state thing? if you're a smoker F**k off and don't take our conception vitamins?? or this there really some legit reason you shouldn't mix tobacco with vitamins?