text: Because it is a drug, and drugs affect your brain. They send litle chemicals called neurotransmitters into your neurons, and give a certain feeling. Since they flood the neurons with that feeling, the neuron shuts off, so the body doesn't ever make that feeling EVER again. So, then since you crave that feeling again, the body wants MORE meth. \nThat's why one hit can make you hoooked.\nDon't try it.