Urban legend or truth

Ok I vaporize my pot due to lungs not as good I have emphazima at 60 years old. I quit cigs 1 year ago 19th of this month. Anyways I have a several vaporizers silver surfer Da Buddda KIA and a flight box. I think Volcano is the ultimate one but way to expensive and to many parts to replace all time BUT I hear that when you exhale vapore its the same strength as the inhaled vapor. SO theroretically you could exhale into a bag. Fill the bag up with exhaled vapor and get high again on the bag of exhale air.....OK WHAT TO YOU THINK>....am I crazy or did I really read this.

I say urban legend, because if it's the same strength that would mean you're not absorbing thc.

One thing to keep in mind, exhailed smoke is filled with CO2 and not Oxygen. It would still have some potency, but re-inhaling CO2 from a bag will cause hyperventalation. Mix in the smoke and you could get very light headed, pass out, and in general feel ill. Not sure its a good idea.