When sodium nitrite enters your body, it will be rapidly absorbed into your bloodstream and will begin oxidizing the iron in hemoglobin, transforming it into methemoglobin. This will prevent your blood from transporting oxygen to your tissues, so even though your lungs will function normally, your body will enter a state of generalized hypoxia. Your brain will be the first to suffer, sending emergency signals that will make you breathe faster, but this response will be useless because your blood will no longer be able to distribute oxygen to your cells. You will feel a growing air hunger, your breathing will become labored, and you will feel a sense of chest tightness while your heart accelerates in a desperate attempt to compensate for the lack of oxygen. The more you breathe, the more you will feel that breathing does nothing, increasing your sense of panic and anguish. Your extremities will start turning bluish due to cyanosis, you will experience dizziness, mental confusion, a feeling of lightheadedness, and a progressive detachment from reality. The air hunger will worsen, you will feel your muscles contract involuntarily in a desperate attempt to take in more oxygen, but your blood will not be able to transport it, and your brain will slowly begin to shut down. You may experience seizures or involuntary muscle spasms due to the lack of oxygen in the brain, while your vision will blur, and you will feel a strong internal pressure in your head. You will hear a ringing in your ears, your movements will become uncoordinated, your body will grow weaker, and your breathing will become shallow and ineffective. Just before losing consciousness, your heart will begin to slow down, your body will be completely devoid of strength, and finally, cardiac arrest will occur due to a total lack of oxygen in your tissues.