It's not clear how many will go on to have the full-blown respiratory ailment, researchers said
From: http://redirect.viglink.com?u=http%3A%2F%2Fwww.webmd.com%2Fsmoking-cessation%2Fnews%2F20160518%2Fmany-smokers-have-copd-symptoms-without-diagnosis%3Fsrc%3DRSS_PUBLIC&key=ddaed8f51db7bb1330a6f6de768a69b8
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