Stumbled across this shocking statistic:
http://www.lungcanceralliance.org/pr...LC2010_000.pdfAccording to a national survey in 2006, over 60% of lung cancer patients had already quit smoking, 20.9% were current smokers and 17.9% had never smoked.
I have to wonder whether the absence of nicotine among the former smokers did a number on the immune system, kicking off the cancer proliferation.
Since Swedish snus users don't have any higher incidence of lung cancer, maybe there's something to my theory.
Lung cancer mortality: comparing Sweden with other... [Scand J Public Health. 2009] - PubMed result
Maybe it is healthier to switch to vaporized nicotine than it is to simply quit all nicotine use.