Scars ain't coo. Scarification, cutting, burning, yadda yadda yadda. Marring your physical form is not exactly the most... healthy thing one can do to oneself. I have scars on my arm, hands, knees, hip, and face. These are all accidental, from the various accidents I've been involved in, and from the surgeries involved therein.
Let the professionals cut you open, if it's neccessary. You may know your body better, but they know your physiology. You can never be rally sure if you might, say, hit an artery. Then things get fuxxored. Burning yourself is just moronic. Especially when it's with something as unclean as a cigarette.