I did that study a few years back. It has been ongoing since about 2006. In fact I did two different series of tests. The first one was such that I had to go get a bronchoscopy once every two weeks for six weeks. In each case I was kept overnight and released the following day. after a few months I was invited to try another session. I was not kept overnight this time.
In case you may not be aware, a bronchoscopy is painful. The medication they give you to numb your throat may make you nauseated. It did so to me.
Also after those two bronchoscopy sessions I was invited again for a study in which a tube was to be put into my nostrils and that was really painful.
I once read an article about a person who went through such a study ( and I think it was one study in which he got a tube down his nose almost every day for about two or three weeks) and he got paid some $7000. I only made $200 for each time I got the treatment. The bronchoscopies netted me about $800 total. But from what I recall of that article, it was in some other state not in NY.
It is a lot of pain to tolerate for only about $200 or $250 for each time they put a tube in your throat or nose.