Toxic over-exposure starts at 9% to 12% concentrations, the heart rate drops further, the victim may have more shallow breathing or stop all together, they do not respond to any outside stimulation and may begin to involuntarily gasp, belch, or vomiting which can lead to aspiration if they do not get turned on their sides.
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In Brazil, it is a traditional (though illegal) drug taken during Carnaval parades, known as "lança-perfume".