That reminds me of the slue of studies linking B6 and B12 to cancers, as well as specifically lung cancer, and especially for current/former smokers.

It struck me as odd that most energy shots were basically a tiny bottle of various vitamin B's.

A couple random examples. Each made its rounds from most news outlets:

2017 CNN - High doses of vitamin B tied to lung cancer risk, study says

...this was the wrong one, but now I remember this too..

2023 New Scientist - Vitamin C and E supplements may make lung cancers grow faster