Cherechedza ndima iri pasi apa uye wozopindura mubvunzo pashure mumutauro mumwe chete sezvinoita ndima: Passage: The primary risk factor for COPD globally is tobacco smoking. Of those who smoke, about 20% will get COPD, and of those who are lifelong smokers, about half will get COPD. In the United States and United Kingdom, of those with COPD, 80<unk>95% are either current or former smokers. The likelihood of developing COPD increases with the total smoke exposure. Additionally, women are more susceptible to the harmful effects of smoke than men. In non-smokers, exposure to secondhand smoke is the cause in up to 20% of cases. Other types of smoke, such as, marijuana, cigar, and water-pipe, also a risk smoke. Water-pipe smoke appears to be as harmful as smoking cigarettes. Problems from marijuana smoke may be only with heavy use. Women who confer smoking during pregnancy may increase the risk of COPD in their child. For the US and United Kingdom, women and former smokers have the same amount of COPD.
80<unk>95%