Amyl nitrite = "poppers"http://en.wikipedia.org/wiki/Amyl_nitritehttp://en.wikipedia.org/wiki/Poppers
"Amyl nitrite, in common with other alkyl nitrites,is a potent vasodilator (i.e., it expands blood vessels, resulting in lowering of the blood pressure). Alkyl nitrites function as a source of nitric oxide, which signals for relaxation of the involuntary muscles. Physical effects include decrease in blood pressure, headache, flushing of the face, increased heart rate, dizziness, and relaxation of involuntary muscles, especially the blood vessel walls and the anal sphincter. There are no withdrawal symptoms. Overdose symptoms include nausea, emesis (vomiting), hypotension, hypoventilation, dyspnea (shortness of breath), and syncope (fainting). The effects set in very quickly, typically within a few seconds and disappear soon after (within minutes)."
"User surveys are hard to come by, but a 1988 study found that 69% of men who had sex with men in the Baltimore/Washington DC area reported they had used poppers, with 21% having done so in the prior year. The survey also found that 11% of recreational drug users in the area reported using poppers, increasing to 22% among "heavy abusers," with an average age of first use of 25.6 years old. Both survey groups used poppers to "get high. It was reported that this group reduced usage following the AIDS epidemic, while the drug-users had not. A 1987 study commissioned by the US Senate and conducted by the Department of Health and Human Services found that less than 3% of the overall population had ever used poppers."