"Social smokers" are still at risk
One of the rampant health myths that need to die is that smoking just a little when you're out with friends doesn't mean you're a smoker. "It is common for people to believe that 'social smoking' will not affect them," Dr. Sands says. "Each cigarette one smokes actually creates measurable changes that can be observed." The risk for developing lung cancer increases after 100 lifetime cigarettes, he says. "Many people find that to be a shockingly low number," he says. But even light and intermittent smoking can cause substantial health risks, according to a review of research.
Second and third-hand smoke can lead to cancer
Twenty-five percent of lung cancer victims have never smoked, says Bernard Park, MD, Deputy Chief of Clinical Affairs of the Thoracic Surgery Service at Memorial Sloan Kettering Cancer Center. But, secondhand smoke—and potentially thirdhand smoke, which is nicotine residue left on clothing and surfaces—can increase your risk. "It is well-documented that secondhand smoke exposure is associated with increased lung cancer risk in never smokers, particularly those who live with active smokers," Dr. Park says. "The risk, much like with direct cigarette smoking, is dose-dependent and can be as high as 25 percent compared to never smokers who live in a smoke-free environment." If you live with a smoker, have them go outside to smoke, wash their hands afterward and their clothes frequently. And yes, thirdhand smoke is real.