Selecting the appropriate nicotine strength in disposable vape is crucial for a successful transition from smoking. Nicotine strengths are usually indicated in milligrams per milliliter (mg/mL). If you're a heavy smoker, opting for higher nicotine strength, like 50mg/mL, might be suitable initially, while lighter smokers might find 20-30mg/mL more appropriate. It's recommended to consult with a healthcare professional to determine the best nicotine level for your individual needs.