What do I do to quit smoking?

I'm 15, and I was sorta joking. But if he really wants to quit he should just try harder.
 
I remember smoking at 15 that's when I quit for a month, then a friend came over and was smoking outside of my window saying "you know you want it you know you want it" then I took a drag, then I had started seeing a guy who smoked, started back up,, that was like 8 years ago,, I really do need to quit,., my family has a history of lungcancer,, and dying from it,,smoking pot is something i really fuckin miss though,, it's much better for you, it's prescribed to lung cancer patients so they have a productive cough,, cigarettes can supress that.