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Nitrates are one of a type of drug known as vasodilators, that are used to treat angina in people with coronary artery disease or chest pain caused by blocked blood vessels of the heart. They work to control angina by relaxing the coronary arteries so blood can flow more easily to the heart.
Gateway drugs are substances that when consumed give way to harder, more dangerous drugs. These milder substances, such as nicotine or alcohol, are believed to open the door to drugs such as meth, heroin and cocaine, which can lead to addiction. Gateway drugs boost dopamine levels, which increases pleasure.