Im teenager i smoked i think 7 months but not everyday i stopped for 2month and im not smoking anymore is it appear in chest xray wther i smke or not?

Smoking: Typically changes seen on chest x-ray occur after years of chronic smoking. At your age and with your history of exposure I would not expect your chest xray to show anything abnormal. Would recommend not restarting smoking, avoid developing the habit. Smoking comes with lots of health risks. See CDC website: http://www.cdc.gov/tobacco/data_statistics/fact_sheets/health_effects/effects_cig_smoking/