Smoking and effects on teens?

im only 16 but im smokin. it started as a casual thing but i started doin it regularly for like 2 months. a pack lasts me like 3 days. i tried to quit but i couldnt :/ what effects will it have on my growth, im already huge so yea.... i can go like a week without a cig, but its more the mental addiction. thinkin a need a cig, but not really needin one. you know when you dont have one, u just think u do? thats how it is im not physically addicted but mentally. i know im a moron for doin it but how long do i have till my lungs are ash?