Yeah dude, I know what your talking about. I have this connection that always has bomb stuff, always smells wonderful, lots of crystals, vibrant green... bomb ass stuff. Anyway, the first time me and my friend went over to pick some stuff up, he asked if we wanted to take a hit of this blunt (which had the weed we were buyin loaded in it) so me and my friend took a hit. As soon as I toked up I knew it was kickin in, which hardly ever happens but my friend felt the same thing. We ended up blazed off one toke! My friend was afraid to drive anymore so we just chilled and watched bum fights at this guys appartment. Pretty sweet stuff though...

The reason it only lasted 30 minutes (my high didn't last long either) is because it was only one hit. I think a high-grade strain like these ones just hit way faster but you still need to smoke more for it to last.