What metaphors are used in Thank You for Smoking by Christopher Buckley?

Example of Metaphor:

"Let's be honest kid — Gomez O'Neal seemed to be doing the voice-over for what was left of his conscience — you're a washed-out, forty-year-old snake-oil vendor on the payroll, until recently, of people who sell death for a living. On the Karmic food chain, you're somewhere between a sea slug and eel shit.