Nicotine strength is personal. What works for your friend might not work for you. Start with a reasonable guess, then fine-tune. And remember, you can always adjust later—that's the beauty of vaping. If you're ever unsure, ask a knowledgeable shop staffer or check the manufacturer's recommendations for your device.

Disclaimer: This guide is for educational purposes only. Vaping products contain nicotine, which is addictive. Not for minors. If you are pregnant, nursing, or have a medical condition, consult a healthcare provider before using nicotine products.