Did Biden's son die because of toxic burn pits?

His brain cancer was glioblastoma:

https://rarediseases.info.nih.gov/diseases/2491/glioblastoma

Fact check on burn pits and brain cancer:

https://www.factcheck.org/2019/12/biden-exaggerates-science-on-burn-pits-and-brain-cancer/

Even though some vets have probably developed cancers and other diseases from toxic burn pit exposures, Biden's son may not be one of them.