Vaping can increase your risk of exposure to certain harmful chemicals that can harm your health (for example, cause lung damage). Vaping can also lead to exposure to nicotine, an addictive substance. Loss of taste, dry mouth, very dry skin, fatigue, palpitations, nausea, headaches are signs that you are vaping too much with your e-cigarette. Excessive vaping can be caused by an overdose of nicotine.