Been just over 2 years clean off Meth following a year and a half of constant use, and I can say from personal experience: Wether it's 2 weeks or 2 years, it never gets any easier trying to stay clean.
As much as this drug destroyed my life over those 18 months I still can't help but think about it on a daily basis.
It's not so much my willpower keeping me away, but the fact that I ex-communicated every dealer and user that I knew.
Now, 2 years later, I couldn't even get it if I wanted to... and sadly enough, I've tried.
The biggest problem as I see it, is that our minds tend to romanticize things. When we think back to our childhood we always immediately remember the good things about being young, and wish we were back in those times again. We don't seem to remember all the things that utterly SUCKED about being a kid or teenager.
The same idea seems to hold true when thinking about drugs. I remember all the parties, friends, and kick-ass times that I never would have experienced had I not gotten into meth. I remember all the highs, and coincidentally, fail to remember all the lows...