[garganzol]

Cancer thrives on any kind of NAD source, not specifically Nicotinamide Riboside. Even milk poses a risk of increased tumor growth (it contains NAD, a lot of it). But it only applies to those who have the ongoing oncology in the first place, so... blaming NR for causing cancers is probably a misfire.

[nradov]

Many people have small, slow growing tumors which aren't currently causing clinical symptoms and may not even be reliably detectible through the usual screening tests.