I'm a few years older than your dad and was also a pot smoking hippie. Did a LOT more than just smoke pot though.

Regarding the laughing and the fun times, I don't think it has to do with the difference in weed now as compared to the weed back then. I think it has more to do with the differences in ourselves and our surroundings.

Like everything else in life, when something is new, it's more fun, more exciting. Back then, smoking pot was new, not only for us, but for our friends as well. It was very easy to get into a group laughing fit. Fun times..

But now, smoking pot is kinda of old hat. We're all used to it and being that we're used to it, it's just not as much fun anymore.

Anyway, that's my take on it.