There is a wonderful smoking sessation product out now called Chantix
...ask your doctor about it! I had tried everything to quit..the patch
(twice), gums, candies, Welbutrin (twice), cold turkey etc...Nothing helped...but the Chantix helpeed me quit. It blocks the pleasure receptors in the brain that tell you you want another cigarette. As for the blood, it could be a number of things, I would see a Doctor to be safe.