OP:
Per Wikipedia, after a 2013 review of nicotine toxicology:
"the 2013 review suggests that the lower limit causing fatal outcomes is 500–1000 mg of ingested nicotine"
Ever known someone or heard about someone in your proximity that has had nicotine poisoning, or even a friend of a friend of a friend of a friend whose had nicotine poisoning? It happens very, very rarely.
Studies prior to the 2013 review were done with incorrect/intentionally made up data to further an agenda, same with secondhand cigarette smoke.
Google is a thing