Yes, after a slow extended leak, as can carbon monoxide. This image from this article, Quantitative PET Scan Findings in Carbon Monoxide Poisoning, shows CO neurological damage on the 4th line. read more
For your research, type in “MRI or PET images of brain damage from natural gas or carbon monoxide leaks”. These brain scan images above are from a case study in the link provided in the above paragraph. read more
My name is Shawn. I am a Professional Nurse in the neurology sector at the hospital as well as an epilepsy patient myself. I can say that it may be possible that the natural gas leak causes seizures since your brain requires a very high oxygen-concentrated blood supply. read more
He said that gas can eat through Teflon tape wrapped around the threads on the pipe joint. Just to look at the leaking pipe, it looked safe. Other causes for gas pipe leaks are expansion from temperature changes, use of copper piping, older pipes, rusting and ground shifting. read more