No. A closed IGET disposable should not be opened and filled with oils, herbal extracts, cannabis products or other substances. The heating system, wick, seals and electronics are designed around the product as manufactured, not around arbitrary liquids or materials added by the user.
Why a closed device should stay closed
Opening the housing can damage seals, expose the battery and create leakage or short-circuit risks. It can also change the way material reaches the coil. A substance that is suitable for one type of vaporiser is not automatically suitable for a disposable e-cigarette.
Oils and extracts can behave differently when heated
Viscosity, boiling behaviour and ingredients differ widely between substances. A coil designed for the original formulation may not wick or heat another material correctly. That can lead to leaking, overheating, burnt material or unpredictable aerosol exposure.
Do not use household or food oils
A product being edible does not make it suitable for inhalation. Cooking oils, essential oils and improvised mixtures should not be put into a vape. Inhalation involves different exposure pathways from eating or topical use.
Cannabis vapes are separately regulated
The TGA consumer guidance notes that cannabis vapes are subject to separate strict regulation. A consumer IGET device should not be converted into a cannabis delivery device by adding another substance.
If you need a different product type
Use hardware specifically designed and lawfully supplied for the intended material, and follow the instructions for that product. Do not modify a sealed disposable as a substitute for purpose-built equipment.
Bottom line
IGET disposables are closed systems. Leave the internal contents and battery housing intact, and do not add other substances. If the exact product is unclear, identify the model before use rather than experimenting with the hardware.