That is due to vasodilation, not O2 absorption.
Why would anyone want bronchodilators or steroidal anti-inflammatories when natural substances are so much more effective and safe, to boot (something that cannot be claimed for any drug)?
Ask any asthmatic where they can get immediately acting bronchdilators. Not from garlic, cayenne, or capsaicin. Ask a cardiac patient where they are going to get natural anti-arrhythmics.
Personally, I am glad that you are not my physician. I've seen witch doctors before, and you are right up there with the best of them.
Oh shallow one, ask any asthmatic that has discovered Lobelia and you will see why we definitely do not need med mafia doctors, nor big pharma.
Your med mafia doctor’s investment advisor is so glad that you eschew knowledge.