How does he plan to use the pack of cigaretts in catbird

It was his idea to puff a few puffs on a Camel (after the rubbing-out), stub it out in the ashtray holding her lipstick-stained Luckies, and thus drag a small red herring across the trail. Perhaps it was not a good idea. It would take time. He might even choke, too loudly.

Explanation:

depressed people should not argue