My little thumb sucker

Briggs is 6 months old and is a thumb sucker... a wake up in the middle of the night with thumb in mouth, will suck the left thumb when you take the right one out, i LOVE my thumb... Thumb Sucker... and it scares me! It is the most precious thing anyone has ever seen but I'm not sure if I will be able to break him from it later. I already have a 3 year old (Landin Claire) that doesn't want to give up her paci. She said that she would give it up when she goes to school. Not sure if she meant preschool or kindergarten... Well for the time being I am putting the paci in his mouth to try and keep him from sucking his thumb... We will see how it shakes out :)