What metaphors are used in Dog Soldiers a Novel by Robert Stone?

Heroin represents greed, death, and violence. Heroin is one of the main objects in the story. John Converse, wanting to make some type of profit while in Saigon strikes up a deal with Charmian, Converse's lover and a drug dealer. Early in the story Charmian shows Converse a brick of heroin and he examines