Yes, L had. And L would say more, especially as long as his snide jabs went unremarked upon. Like most children or immature individuals, L tended to enjoy seeing just how far he could push people. His experimental streak didn't help with that, either.
"That's a fire hazard," he said, glancing down at the cigarette. "And you're polluting your lungs and lessening the chances of passing on your DNA to the coming generation." After uttering that thought, L paused, nibbling his thumb. "I wonder if that would be a bad thing," he murmured thoughtfully.