Can you please tell me what your basic pulmonary test is like...

I hate to ask a question that may have been asked, but I tried to look it up and didn't find the answer I was looking for. This is my question I have had asthma since I was a child and my weight as made it worse over the years. When the surgeon sends you to get a pulmonary (sp?) test what exactly does it consist of? I have had the test where you breathe in the carboard tube before, I have even had the test when you have to walk on a tread mill and then breathe in something looking like a vacuum. Can you please tell me what exactly you do for this specific test. I really need to know because I quit smoking 2 years ago, but with all the stress, I have been smoking here and there and I don't want to jeopardize my chances of getting the surgery. Thanks a lot in advance! You guys are so great and so helpfull. :)

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