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About 5 years ago, my dad, who is a physicist, did a year's sabbatical in Austria. The students at the Austrian university were like chimneys. But his optics lab had all this expensive optic equipment, and smoke leaves a residue on the glass that has a significant impact on the experiments, so smoking was banned in the lab itself. He said that after spending a day in the clean lab, and just walking out into the hallway, it was always a shock. All of his lab assistants would immediately grab their cigarettes and start puffing away, surrounding him with a cloud of smoke. He was always glad to spend the entire day in the lab so he could have fresh air.
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