Again, if there is any evidence for that, I'd love to see it. The fact that Kerry Mullis thought of PCR while trippin' balls isn't much more than an anecdote, and stopping to think about all the nobel-worthy work which wasn't thought up while tripping balls...

Put it another way, invention and new ideas haven't exactly increased since Albert Hoffman's big idea. You'd expect there to be a lot more cool stuff if this were really true, as there are certainly a whole lot of people who have tripped balls in the last 50-60 years.