Yes, you can take your vape to Hawaii, but you must strictly follow TSA and airline safety regulations regarding lithium batteries and liquids. All vape devices and spare batteries must be packed in your carry-on luggage; they are strictly prohibited in checked bags because they pose a fire risk in the cargo hold. For the liquids (e-juice), you must adhere to the 3-1-1 rule, meaning containers must be 3.4 ounces (100ml) or less and fit inside a single quart-sized clear bag. While Hawaii allows the possession of vapes, remember that use is prohibited on all commercial aircraft and inside most public buildings, including airports and many beach parks, under state "Smoke-Free" laws. Always check your specific airline's policy to ensure no recent updates affect your travel.