Should the abundance of evidence linking smoking to all manner of cancers not be sufficient, consider this: National Cancer Institute researchers have found that the odds ratio for esophageal adenocarcinomas is more than doubled in smokers compared with never smoking. The good news is that those who have quit for 10 years or more have a significantly reduced risk.
PositiveTip: Never starting to smoke is the healthiest, but quitting yields big benefits, too.