Hypochondriacs. 😎 WHO is one of the few organizations who have even batted an eye because they're obligated, but I feel strongly in saying this condition doesn't exist and if it does, it's often within centralized groups of people and can be explained better by sociology & psychology than the effects of some mysterious, scientifically unprovable, or even observable reaction.
That being said, if true, the actual prevalence of this condition is so extremely limited its not worth bringing up as a counter point to justify the OP. People with connected wearable devices today (and there's a few million or so out there now) have no problem, as evidence. There's more issues with allergic reaction, which is a real condition to be concerned about.