Smoking leaves an "archaeological record" of the hundreds of DNA mutations it causes, scientists have discovered: ...a 20-a-day smoker would rack up an average of 150 mutations in every lung cell each year. The changes are permanent, and persist even if someone gives up smoking • /r/worldnews

Smoking leaves an "archaeological record" of the hundreds of DNA mutations it causes, scientists have discovered: ...a 20-a-day smoker would rack up an average of 150 mutations in every lung cell each year. The changes are permanent, and persist even if someone gives up smoking (bbc.com) via Pocket http://ift.tt/2fALAHH