Older x-rays aren't very strong and therefore you don't need to worry about film with an ISO of 800 or less. However, recent scanners, such as TSA CT (computed tomography) scanners can damage film immediately and after one scan.
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Take your film out of all its packaging and wrappers and store it in a transparent, ziplock bag (the same way you would for all your liquids in your hand luggage). This way you can easily show it to airport security for hand inspection!
Instead of packing all of your clothing in your checked luggage, pack a few items in your carry-on. Whether you choose jeans, undergarments, or shoes, tucking your vape kit away in layers of clothes makes it easier for your kit to go entirely unnoticed by TSA.
The X-ray used to inspect carry-on baggage is much milder than the X-ray for checked baggage. Low energy X-ray will not cause noticeable damage to films under ISO800 such as Fujifilm Instax mini, Instax wide, Polaroid Originals 600 (ISO640) and SX-70 (ISO160) films.