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I think these machines will not be able to give 100% accurate result. In studies of this type there will always be errors. But even if this percentage of accuracy is high, then this will benefit humanity.

I'm not knowledgable enough to say if these machines will work fine or not.
I'm more thinking about the morality of the system. Imagine this machine tells you that you may have cancer on an airport.. before a very long flight ... what would go through your mind?

Hmm.... very good guess, I hadn't even thought of. But the test result is not a diagnosis. Only a number of clinical tests can accurately a final diagnosis.

it's not the machine's job to diagnose you with cancer, more like warn you that you may have a problem with your health. seek a medical professional.

If this device simply says that you have health problems, this is nonsense. Health problems for any person! He just does not know about them. And the user who used this machine, and got the result that you have health problems, will contact the doctor. The doctor will refute or confirm this diagnosis.) Question. If you need to see a doctor, why do you need this device? Which will not give you the exact answer and make you care and worry!

Hello,
please the following article:
https://medium.com/healthmonitor/detection-of-lung-cancer-e17f6a7a03ea

Modus operandi of Health Monitor
The basic concept of the analysis is the spectral analysis of the mixture of gases that the subject exhales.

The spectrum of the exhaled air always changes if someone suffers from any pulmonary pathology. The device allows these changes to be observed, measured and registered.

Metabolism of cancer cells significantly changes and they begin to synthesize a number of volatile organic compounds:

Ammonia

Isoprene

Ethan

Pentane

Acetone

Each of these substances absorbs light with a certain wavelength. Due to their technological features Health Monitor capture and quantify these spectral disturbances.

If high concentrations of the above compounds are detected in the exhaled air, then this is an occasion to undergo a full screening involving CT, MRI, and so on.

Could you link some scientific papers that cover the fundamental researches which have been done on this specific topic?

Hello.
Here is the very first answer of Google https://www.ncbi.nlm.nih.gov/pubmed/12796197
And on the Russian-language resource is https://cyberleninka.ru/article/v/osobennosti-spektrov-pogloscheniya-vydyhaemogo-vozduha-bolnyh-neinfektsionnymi-hronicheskimi-zabolevaniyami-hronicheskaya