Now strictly speaking, Lex did not have anything against smoking up. After all, one really cannot live in New York without having at least half your friends and acquaintances partake in some kind of recreational substance - whether that be alcohol or something else. But the man had literally ordered a massacre, which had caused chaos across the entire city, and was actively resulting in severe harm to the city and its people, while he sat here and smoked up.
That was just wrong. But then again, what did he expect?
It had been a while, but Lex put on his Notorious Anonymity mask - the one which contained a bit of divinity and grew as it absorbed more of it. In the illusion above the city, everyone could see that the person had put on a mask, though they couldn't see him to begin with since they were seeing the scene through his eyes.