Could anyone blame me?

I've asked my roommate several times not to smoke in the apartment. He still does it. The agreement when I moved in was for no smoking. It says it in the lease. I've written to my landlord but she hasn't responded. I'm moving out in a week but until then I have to put up with his nasty, selfish, hurting-my-health-unless-I-buy-a-gas-mas… habit. I can feel my brain getting stupider and my lungs getting smaller. If I bust into his room with a fire extinguisher and spray it until it's empty, would it be wrong?