Little bit more on this subject. I also think that in addition to keeping vapor moving over the aveoli in your lungs to promote absorbtion ( which doesn't happen just holding your breath) there is the fact that there is no absorbtion at all in your trachea and main bronchi passageways. So, if looking to maximize cannbinoid uptake, it makes sense to stop drawing with enough room left in your lungs to clear your rig, your throat, and main passageways into your lungs.
https://www.massroots.com/news/holding-hits-and-the-effect-of-cannabis-on-your-lungs
A
study in June of 1989 found that being high is not effected by the amount of time that you hold the smoke in. Participants were given three different conditions to hold their breath under, ranging from 0 to 20 seconds. The procedure for smoking was standardized by number of puffs, puff volume, and the post-puff inhalation volume. Smoke intake was monitored by looking at the level of carbon monoxide in the air before and after smoking. Although everyone that participated felt the effects from cannabis, they did not see any different between those that held their hits and those that didn’t.
And
http://neurobonkers.com/2012/05/26/...s-policies-interception-and-total-absorbtion/
The evidence regarding THC absorption and duration of breath holding is surprisingly limited, the consensus appears to be that the majority of active components in cannabis are absorbed relatively instantly and any negligible effects from extended breath holding are simply a result of excessive carbon monoxide exposure. This is good news, there is no reason to hold cannabis smoke down for much longer than a couple of seconds, in fact doing so actually results in wholly unnecessary additional exposure to smoke and tar. There is more good news, it seems clear that heavy cannabis smoking is not particularly good for lung function but surprisingly perhaps, it seems occasional use may actually have beneficial effects. A twenty year study found that users who smoked up to one joint a day actually had increased lung function and this effect stood the test of time even for long term occasional smokers:
“With up to 7 joint-years of lifetime exposure (eg, 1 joint/d for 7 years or 1 joint/wk for 49 years), we found no evidence that increasing exposure to marijuana adversely affects pulmonary function”
The moral of the story? If you choose to smoke, you don’t need to do a Clinton and not inhale at all, but you certainly don’t need to do an Obama either – failing to exhale will do you more harm than good. More importantly, keep your smoke an occasional habit and you may just end up with stronger lungs than you started with.
, switched entirely to vapour. I take a medium sized hit leaving a decent amount of room in my lungs, hold for 7 (can really taste the flavour from the inhale here), draw in some fresh air then exhale slowly. Seems like a decent compromise for me! I don't feel like I'm "wasting" vapour, full flavour, and I never get headaches or feel any strain.
