I'm 18 and have been smoking for about 1.5 years. I've never approached anywhere near a pack a day, for I usually only smoke while drinking. In the past few months, however, I've been averaging maybe 20 cigarettes per week. This morning, after two days of binge drinking and heavy smoking, as well as just having got over a chest cold, I coughed up roughly four "spits?" of blood.

Cancerous? Due to extreme short term exposure and the circumstances?

I've decided to quit--seeing that blood scared the hell out of me.