Because oh the toxins in the onion, they trigger our tear ducts.
Answer:
Smoking.
Being overweight or obese.
Lack of physical activity.
Too much salt in the diet.
Too much alcohol consumption (more than 1 to 2 drinks per day)
Stress.
Older age.
Genetics.
Cardiac output.
Peripheral vascular resistance.
Volume of circulating blood.
Viscosity of blood.
Elasticity of vessels walls.
Explanation: A lot of things acually.
