.......if one were to smoke around 10 cigarettes a day, develop a really bad, barking cough, then start coughing up blood, could that be a sign of lung cancer?

aids.

How long were you smoking for?

A bad cough and coughing up blood can literally be over 20 causes. Here are a few popular:



Blood clot in the lung
Cancer
Vasculitis (Inflammation of the blood vessels in the lung)
Pneumonia


In any case, see a doctor as soon as humanly possible in the event that it is sinister, time is critical.

That means you should stop being a pussy and double up to 20 a day.

Thats the shit!

Might as well patch up those lungs with tar !!

No just means you have weak lungs. Slow down on smoking or stop smoking all together. Remember if you smoke getting sick or bad coughs are twice as more likely. Instead of start to finish getting over a cold of 5-6 days its now 12-14 for me.

Coughing up anything but air is generally not good, getcho ass to the doctor.

An alien is going to burst from your chest.

You never know....

I've been smoking around a pack a day for the last 17 years, and I don't cough up blood, so as xxombs said, get your ass to the doctor.
Personally I doubt it's cancer, but something clearly isn't as it's supposed to be.

Thats the shit!

Might as well patch up those lungs with tar !!

Don't be a pussy - kick it up to 30!

Hypothectically.....

http://img151.imageshack.us/img151/4687/blunt2sd.png

nah you typically get lung cancer when you old, when your cells r so old they can no longer properly dispose of shitty cells.

I've been smoking around a pack a day for the last 17 years, and I don't cough up blood, so as xxombs said, get your ass to the doctor.
Personally I doubt it's cancer, but something clearly isn't as it's supposed to be.

I've been doing that for almost 4 years now.

*doesn't cough blood for at least 13 more years*

Call a ambalance. (http://ambalance.ytmnd.com/)