R u talking chest x ray....if yes then it do not show any evidence of smoking or non smoking unless some pathology occur. -Generally, nicotine will leaves your blood within 1 to 4 days after you stop using tobacco, and cotinine will be gone after 1 to 12 days. Neither nicotine nor cotinine will be detectable in your urine after 3 to 4 days of stopping tobacco products.....if any further query/please respond....