Quick question for a somewhat unique case

[Burnt Toast]

So you're saying that no matter how little body fat a person has, there is always a build up effect over time?

Exactly. All human bodies have fat cells (millions of them) whether theres visible body fat or not.

I think eventually you would reach a point where the THC content in the fat cells isn't rising anymore.

Nope. Doesnt work that way. Sorry.