I've opted out twice and it really hasn't been a big deal. It's slightly slower, but the security guys treated me fine. It was no more invasive than being patte

I've opted out twice and it really hasn't been a big deal. It's slightly slower, but the security guys treated me fine. It was no more invasive than being patted down before entering a nightclub to make sure you aren't carrying anything pointy. Given your health concerns, opting out seems like the clear choice (though bear in mind I'm pulling from a sample size of only 2).