im pretty young, but in my opinion it's not the weed that's getting better, it's just the growers. people are putting in so much more time, and money, and expensive equipment, and special chemicals etc. it only makes sense that the weed they grow is better than the weed that was grown 40 years ago. Herb can't evolve to get that much stronger by itself, the better the growers are the better the bud will be.