For the people that travel a lot I have a question. When traveling to a place that has a higher elevation than from where you live ? how do you know how much higher you have to set your oxygen? Also your are not to be around anyone that smokes, so does that mean you can not go into any place where there could be some people that smoke? I did like to go gambling maybe twice a year and is that something I can no longer do because of people there smoking? Any input would be helpful
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