I know someone will correct this, but CS burns everywhere and effects your lungs. I've been exposed twice to each, CN is like a really bad sunburn, slightly painful, but bearable, CS contains an agent, that when inhaled makes you feel like you can't breathe, like there's in elephant sitting on your chest. You feel as if you can't breathe, thus forcing you to naturally breathe deeper, thus getting more. The second time i was exposed to CS, i knew what i was gettign into, but as soon as it hit me i though "Fuck, they lied to us, I'm going to die!" It does clear up sinuses wonderfully though! I have both times on DVD, i'll look in to posting a quick vid.