If the person is carrying any metal objects, the metal will disrupt the magnetic field or the electromagnetic field. This disruption will cause a classic metal detector circuit to set off an alarm.
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Aluminum foil is not likely to be detected by metal detectors. However, if you use X-rays, you will notice a big black void in the suitcase and will be forced to open it. As a result, aluminum foil can't be used to cover something else at the airport.
Vapes come in all shapes and sizes, with varying degrees of metal and plastic components, but many will set off a detector when you pass through it. If the cartridge contains hard plastic or zirconia ceramic, there's a chance it'll get through, but there's no guarantee because of what's beneath the surface.
If you have a hip replacement, knee replacement, a metal plate and screws, a metal rod inside your bone, or one of many other types of orthopedic implants, you may set off the airport metal detector.
Too much iron in the body can set off metal detectors. This is rare--and weird--because the human body naturally uses iron and other metals such as zinc, chromium and selenium. Excessive iron is possible if you have a genetic mutation that causes a disease called hemochromatosis.