Why did you just start smoking and feel sick and dizzy?

When you do not smoke for a long time or smoke for the first time, a large amount of smoke is suddenly inhaled into the lungs, the blood in the body does not get enough oxygen for a moment, it will cause hypoxia, nausea and dizziness. Daily smoking is not recommended. Long-term smoking is easy to increase the occurrence of heart vascular obstruction, hypertension, stroke and other diseases, endangering people's health.