When I first started smoking and would get massively blazed (off like one bowl of shwag, I swear) I remember getting an absolutely incredible tingling. I was also totally living in the present (you all know what I'm talking about), where I couldn't remember what had happened a couple seconds before. I also remember being really goofy and giggly. I also remember that I couldn't really focus looking at something and that time moved more slowly than I've ever experienced.
At the time (since I was just starting) it was a little bit overwhelming, but now I long for those days. Now the most common thing that happens to me when I get really blazed is that if I'm listening to music or something and close my eyes, I feel like I can still see (just imagining things).