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do your lungs heal when you quit smoking cigarettes Timeline of Lung Recovery After Quitting Your lungs are remarkable healers.
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doi:10.1542/peds.2014-0269
Even if you smoke or smoked, talk to them about your experience

Yauk CL, Berndt ML, Williams A et al (2007) Mainstream tobacco smoke causes paternal germ-line DNA mutation

The study does highlight that 3.5 years is a short period of time to follow up for possible harm

Return the lighter to an upright position, ignite it and check for a steady flame
