One cigarette?: If you truly had a single cigarette in your life, there would be a minimum of any "tar" in your lungs. In people who smoke regularly, it takes several months, with increased coughing and production of phlegm, for the lungs to clear themselves out. Risks of cancer are reduced immediately, but takes 10 years or so to go back to pre-smoking baseline.
Answered 6/8/2015
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