A drug is described by Webster”s New World Dictionary as, “any chemical agent that effects body processes. Is marijuana good or bad? What about the long-term effects? By examining both sides of this controversy, we can decide if marijuana has more positive or negative effects. Marijuana has different effects on people, and certain types of cannabis can cause different effects in the same person.(Mathew, RJ)There are many ways that marijuana can harm the body, both the immediate and long-term negative effects.