What is one of the common street names for marijuana?

One of the common street names for marijuana is "Chiva." This term is often used in various regions and contexts to refer to cannabis, reflecting the slang and culture surrounding the drug. Street names for drugs typically evolve over time and can vary significantly by geographical area and social group. The use of "Chiva" within certain communities highlights the way substances are often given distinct identities that resonate with their users.

The other terms listed do not refer to marijuana; for instance, "Flake" is commonly associated with powdered drugs like cocaine, "Tina" is a street name for methamphetamine, and "Horse" usually refers to heroin. Thus, "Chiva" stands out as the correct answer when identifying a street name specifically connected to marijuana.