Which substance is known for creating a state of euphoria and increased energy?

Cocaine is known for creating a state of euphoria and increased energy due to its powerful stimulant effects on the central nervous system. When consumed, cocaine increases levels of dopamine, a neurotransmitter associated with pleasure and reward, leading to heightened feelings of euphoria and stimulation. This surge in dopamine can enhance mood and increase energy levels, making the user feel more alert and euphoric.

In contrast, heroin is an opioid that primarily produces sedative and analgesic effects, leading to relaxation and pain relief rather than euphoria associated with energy. Alcohol is a depressant that typically reduces inhibitions and produces calming effects, rather than increasing energy. Marijuana is often associated with relaxation and altered perception, but it does not create the same level of euphoria and energy that cocaine does. The unique stimulant properties of cocaine make it distinct in inducing such feelings compared to the other options provided.