Deleted.
He's saying that a full body MRI is so valuable, that if you got one and then smoked for a year, you'd be in the same place as you were before you started, health wise. No loss.
Obviously you'll come out way ahead if you don't do the smoking part: it's very valuable, in other words.
Ok, if this is the argument that you want to use, here is a counterargument that completely destroys your viewpoint.
Most civilized countries don't bill the patient, and it is entirely funded by either taxes or mandatory public insurance. So just like how it is in "big-medicine industrial complex's" best interest to maximize profits, it is in the health system's best interest to lower cost. So if whole-body scans for otherwise healthy (as in no symptoms) people means less profit for those companies, it means less cost for the health system, which would mean they would be promoting (or even requiring) whole-body scans. MRI machines are much cheaper than doctors.
In any case, people like you will get others killed. Like I said previously, with your logic, no one should even be stepping on a weighing scale or getting routine annual blood tests. The higher level goal is to lower the burden of testing to make it cheap and widely available to everyone for routine use.
Consider the case in England where they checked hospital admissions for HIV despite the absence of symptoms calling for it. They found very many patients who were HIV positive and didn't know it. Your misuse of math would've let them stay undiagnosed while the cases mount. Refer to DOI 10.1016/S2352-3018(26)00109-8.