Conspiracy Theories

**WARNING: READ AT YOUR OWN RISK (some theories might be spoilers)**
Who is Nicotine?
# When Naomi bumps into Dominic at the Halloween party he is dressed as Zorro and mentions something about quitting smoking and nicotine. This could quite easily be a coincidence but in novels connections like these usually aren't. He also makes a suggestive comment about the Three Musketeer when talking to Raymond and Naomi. Very suspicious...
# Any other theories?
Any other topics people theorise about?