All I'll say is: you don't actually know if it'll kill you. I mean, how many people have died to lithium overdoses? Even accidentally? Ergo, it probably won't kill you. If you're young, it definitely won't, and the reason is because our bodies are really good at dealing with poison. When you're young, you heal quickly, even internally.
I mean people ingest arsenic and survive it. Lithium wouldn't do much. And, even if it was poisonous enough to eventually kill you, it'd take a while. I'm talking the kinda time that almost guarantees being found and resuscitated, brought to the hospital, etc. And that's provided it could kill you at all, which again, it probably won't.
Tl;dr: I think it'd be a waste of your time to try this one.