Hello
@Max cook and welcome to ECF! You will have no trouble bringing your Juul in to Australia. We are allowed to have mods and eliquids and there are quite a few vapers around now. Just follow the airline guidelines during your flight (s) regarding batteries/liquids etc and you will be fine. Personally, I would carry my extra eliquid in my checked luggage.
The
selling of eliquids containing nicotine in Australia is prohibited but we can import eliquids containing nicotine - enough for a 3 month supply - so very much open to interpretation. If you vape with nicotine then bring enough with you for your stay to save any hassle.
Vaping in public is treated the same as smoking - so if smoking is not allowed - vaping is not allowed.
Hope this helps, and enjoy your stay!