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If you are so ill that you have to wear a portable oxygen tank and can barely walk two feet without having to sit down, you might want to DISCONTINUE smoking. (It's a dead giveaway that you still smoke when your entire body reeks so badly of cigarette stench that it makes the people around you cough.)

HELLLOOOOOOO...YOU'RE ON A PORTABLE OXYGEN TANK!

I mean, this is just my opinion but...