cigerrates, makes skin of the lip more keratinized (thickened) along with potentialities of cracking and fissuring especially during nights when one is exposed to cold
winds. it may be a simple cyanosis
, (Blue discoloration), which you might have observed on tips of fingers and tip of nose, when exposed to cold winds in winter.
Moreover, you can apply vaseline to those areas (LIPS), quit/ reduce smoking habit and avoid facing windows while sleeping, may simply solve your problem. if it still persists , go to a physiscian/ dermatologist