I've been off it for the past 6 months, I used to be a heavy stoner back in the day.
You're going to have to either want to stop or get bored of it. For me it was the later. I was that kid who always had an eighth on him and would sell it to friends and smoke all day. Basically, I got burned out on it, pun intended or not. I don't want to have to buy it from different people who could flake on me any day of the week, being stoned for no reason and all that. So I just stopped, I'm not off it forever, its just an occasional thing now. You don't have to go cold turkey if you don't want to.
So yeah not that tough, especially if you have responsibilities and shyt to focus on. It helps to have other vices too.