Instead of holding it in for a few seconds try to ghost the hit. Basically, try to hold it in so long that when you finally exhale there's almost no smoke that emerges.

Option b for testing is taking a full hit, then running madly about your house waving your hands above your head until you can hold it in no longer. But needless to say, this is a bit on the kooky side.

So in response, yes it works. but only because of oxygen dep.