The main reason is usually the weather.
Hot summers = dry lips
Cold winters = dry lips
To much booze = dehidration = dry lips
The fastest and easiest cure is lip balm.
One thing that I noticed is in the winter if you have forced hot air in your home, that
just takes all the humidity out of your house. You best bet is to try a humidifier in your room.
they have small units and whole house units. You will notice your throat is not dry,
your skin is better and lips will not be chapped. You will see with in a few days how much
a humidifier can and will help you. I have placed a few of the 5 star models below.
DRY CRACKED SLIT LIPS CHAPPED LIPS
There are many causes for dry lips, cracked lips, split lips, and chapped lips.
DRY CRACKED SLIT LIPS CHAPPED LIPS