He must have stopped doing meth. Mind you, the last time I was around Zanta and meth in the same day was in 2005 so one would hope he'd have laid off by now.
He wasn't as unwell back then. I mean, he was still pretty f**k**d but I remember not seeing him at all from around 2007 til about 2010 and when I did run into him again he had lost his earlier at least tentative grasp on reality.
Some friends of mine used to hang out with him around St Patricks Sq back in 2005-06. My group of friends was pretty messed up back then. No worries though, unlike poor Zanta, most of them survived the 20s drug haze quite well and are contributing members of society.