Karwai Tang/WireImage Chrissy Teigen is leaving cigarette smoking in the past. “I’m just furiously chewing nicotine gum tonight,” Teigen, 39, admitted while speaking to Access Hollywood at the 2025 Oscars on Sunday, March 2. “Don’t smoke, smoking is bad, stop now if you can.” Teigen further explained that she’s been an “on and off smoker…