Nicotine withdrawal involves physical, mental, and emotional symptoms. The first week, especially days 3 through 5, is always the worst. That's when the nicotine has finally cleared out of your body and you'll start getting headaches, cravings, and insomnia.
<h2>What are nicotine substitutes?</h2><h3>Nicotine supplements come in many </h3><h3>forms:</h3>
