Is it possible for me get lung cancer if i spoked 30 yr ago and was exposed to second hand smoke for first 5 years of life?

Unfortunately yes: You can get lung cancer even if you never smoked, or had no exposures. Of course, smoking and exposures increase your risk.

Yes: 2nd hand smoke is a rare cause of lung cancer. The risk of cancer drops every year you are separated from smoking but never goes away completely. Of the last 1000 patients i've seen with lung cancer - only 5 had never smoked personally.

Yes: If aged 55-74 consider asking your doctor about the role for screening low dose chest ct.

Yes: 15% of smokers (>100 cigarettes in a lifetime) develop lung cancer. 80% of all lung cancer is caused by smoking. Additionally, numerous other diseases and cancers are related to smoking. Please, speak with your family physician for comprehensive health maintenance. Risks factors: http://goo.Gl/gu9ms screening guidelines: http://goo.Gl/oqvsp.