Nicotine Warning E-liquid may contain nicotine. The strength of nicotine is printed on the label of the bottle in mg/mL. Nicotine is addictive. E-liquid is intended for use by adults of legal smoking age. Nicotine is toxic. Avoid contact with skin/eyes. In case of contact with skin/eyes, flush with plenty of water and seek medical advice. Keep out of reach of children and pets. If nicotine is swallowed it can be dangerous and potentially fatal- seek medical attention right away. Some symptoms of nicotine overdose include: dizziness, nausea, diarrhea, sweating, irregular or fast heartbeat, and headache. Discontinue use and check with your doctor if you experience any adverse reactions to nicotine.