Which of the following is NOT a common name for heroin?

The correct answer is Luna because it is not a commonly recognized name for heroin in drug culture. Heroin is known by various street names that often reflect its appearance, effects, or cultural references. For instance, "Black" typically refers to black tar heroin, a specific form of the drug, and both "Chiva" and "Smack" are widely used slang terms in different regions to describe heroin. The other terms have established usage within communities familiar with illicit drugs, while Luna does not have a similar recognition or association in relation to heroin. This indicates that while certain names may vary by location and subculture, Luna is not one of the established terms linked to heroin.