I think the science is right. Nonetheless, I still hold it in as long as I can, lol.
Some of the feeling/effect you may experience might not just be from the THC though when you hold it in. Just holding your breath until nearly passing out is enjoyable to some and seems to be a ‘high’ of sorts for those that enjoy that kind of thing.
If it is more enjoyable for you to hold it in as long as possible, then go ahead and keep doing that – unless there is some medical reason a doctor or expert is advising against you doing that. I myself cough too easy though, so sometimes it’s hard for me. I say in the end, it is up to you and what you like best. Personally I don’t enjoy holding my breath for no reason, there better be some THC laden something in my lungs to go to all the effort, ha ha.