Marihuana is a herb which has chemicals called cannabinoids that affect the central nervous system by binding to specific sites in the brain and on the nerves. The statement that with the use of marijuana you are in a state of altered perception,distance,time, memory and physical coordination is true. Other effect of using of marijuana include: heart and blood pressure problems,panic reactions, lung problems, impaired mental functioning, flashbacks, headache, dizziness, numbness, hallucinations, , depression, and sexual problems.