I think what you could be experiencing is just the fact that your getting older, and that your life consists of certain requirements you can't fulfill while high.
Also some people just get bored of doing the same thing all the time, but be careful because that's usually what leads others to progress into other, more dangerous drugs. I mean if you ate potatoes every single day eventually you'd want something other than potatoes.
Shit man, people change as they get older, you don't still watch Barney do you? With age, people's preferences, wants and needs, and overall lifestyle changes. I wouldn't necessarily be scared that something's wrong, your just growing up mate. I mean if you don't enjoy being high, then it shouldn't be that hard for you to quit.
But I think if you want to continue smoking (from what I've read it seems you don't have that high a tolerance since you only smoke on occasion) try smoking less. Throughout my life I've stopped here and there from a month up to a year, and when I first smoke again, I'm overwhelmed with intense paranoia cause I'm so high.
