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The first intravenous injection of heroin can be extremely unpleasant, causing vomiting and nausea. Often this experience is enough to scare someone away, but social and psychological pressures may motivate a person to keep trying. After a few more uses, the beneficial effects are obvious. Some users have distinguished between the "rush" and the "high." The rush lasts only one or two minutes and is said to be caused by the injected heroin bathing the brain before it gets distributed by the bloodstream and changed into a more useable form of morphine. The rush is often described as a heightened sexual orgasm, and a great relief of tension, which pervades the abdomen. After the rush, the high lasts for four or five hours and is caused by the morphine diffusing from the bloodstream into the brain. It is described as a warm, drowsy, cozy state. Addicts report a profound sense of satisfaction, as though all needs were fulfilled. There is also a pleasant state of mild dizziness that is not as impairing as alcohol's effects, and a sense of 'distancing' or apathy toward whatever is going on in the environment.