I started smoking back in '82 and from what I've experienced, today's top quality weed isn't any better than top quality weed 20 years ago. There's just a lot more of it going around. Back then I might get something really, really good once or twice a year. Now all I get is top quality seedless dank. So, I think that if you looked at the average THC content of all weed sold in 1975 and compared it to the average THC content of all weed sold in 2005, the numbers from 2005 would be much higher. But that has nothing to do with the inherent potentail of the marijuana itself.

I read an article in the paper a while back that said the main difference is that, in the past, most weed sold in the U.S. was mass produced in Mexico and smuggled in. The focus was quantity, not quality. Now, however, most weed sold in the U.S is grown in the U.S. or Canada by people who take pride in their work and make the effort to grow good weed.