I've been diagnosed with severe stage 4 and on O2 24/7 for over a year now. On bad days I will stay home but for the most part I don't let it keep me from going out. Besides the doctors office and Pulmo rehab I can't remember one time ever seeing another person on oxygen anywhere in this city of over a million people (where do they all go). I was wondering if any of you others ever see people wearing oxygen and do you make it a point to try and have some words with them, just to be friendly or maybe encouraging. Thanks.