Before whatever changed him, Sherlock was still restraining his nicotine addiction. Now, he saw no problem with it-- a legal vice in the face of whatever else tempted lesser people.

"Are you sure? I've yet to see you recover your dignity, for one." He takes a long drag, pleased with his own wordplay, more visibly than usual.

"Chloral hydrate," he breathes out with the smoke. "Easy enough to make. Even easier to use. That's hardly what matters, however."