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A fine use of cigarette smoke!!! (HA)....Well, I would suppose that if the cans let the air in, or let the air out, either way would be a plus. I have heard about some ridge vents clogging up after a few years with dust. Supposedly happens on newer homes with all the fresh dust around. But again, if the cans let more air in or more air out, it's a good thing. The only thing left would be if they detract from the look of the house....there's several on our house, and truthfully, I don't care for the looks of them. But, I'm not about to climb on a two story roof just to change the 'looks'!!
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