tl;dr I don't think I answer your question...
As a regular smoker since 1995, I can say I definitely don't rip four foot bong hits anymore. I also don't go through a half ounce in three days. Now, a quarter lasts me weeks, and a single spliff lasts me a day or three.
Part of that is that I have things I need my brain for, and the other is that I'm wasted on anything more than three hits. I'm living in a country with no designer weed, and what I get here is only a notch or two above Mexican brick. When I lived 1.2mi from a weed store in the US, the heavy THC strains would kick my ass after two hits or less.
Still, some friends who do dabz regularly (back in the states) get ripped well beyond what I prefer to, so I'm not sure the increased high is making smokers consume less. Its probably just me getting old.