Smoking is a detrimental habit that harms health to a great extent. Nicotine in cigarettes causes issues such as lung damage,hypertension and heart issues.
It also accelerates metabolic syndrome, diabetes 2, and insulin sensitivity, and even after giving up, it remains in the system. Nicotine also affects the thyroid and the pituitary functions and reduces the adrenal and sex hormones.
The nicotine enters the skin, mouth, lungs, and the mucus layer 10 seconds after you inhale it, through the blood, arrives at the brain.