Marijuana cultivation and use is illegal in Papua New Guinea, but it is widely produced and consumed. Medical research shows that marijuana can be detected in the body for weeks after use. Long term marijuana use can alter a person's mind. However, a longtime user argued that the effects depend on the individual and how they use it. Young people are especially vulnerable to marijuana's damaging effects on emotional, educational and social development because their brains are still maturing into their mid-20s. While marijuana is less lethal than alcohol, both substances can negatively impact health and should be abused.