• Wrong VG/PG for your device — The #1 mistake. 50/50 in a sub-ohm tank leaks; max VG in a pod system burns coils. Always check your device's recommended juice viscosity.
• Nicotine strength mismatch — Using 50mg salt nic in a sub-ohm tank is dangerous. Using 3mg freebase in a pod when you smoked a pack a day will leave you unsatisfied. Match strength to both device and smoking history.
• Ignoring state flavor bans — California, Massachusetts, New Jersey, New York, and Rhode Island restrict flavored e-liquid sales. Check our vape flavor bans by state guide before ordering online.
• Buying without checking for CoA — No lab report means no safety verification. Reputable brands publish these freely.
• Stockpiling expiring juice — E-liquid expires in 1-2 years. Nicotine oxidizes, flavors mute, and VG/PG can separate. Buy what you'll use in 3-6 months.
• Ignoring the FDA enforcement landscape — The FDA's 2026 seize-and-destroy enforcement means unauthorized products face increasing supply chain risk. Read our FDA vape crackdown guide for the latest.