Dating pot smokers
There are many rumors floating around about why the term 420 is used.
Specifically, researchers found a link between recreational use of marijuana and an increased risk of developing nonseminoma and mixed germ-cell tumors, which lead to a somewhat worse prognosis.
Despite the popularity of the term, most people have no idea how or why 420 became associated with marijuana.
There are a lot of myths and stories about it's origins.
Of course, many teens have no idea that it's an old phrase.
So they use the term liberally in front of adults thinking it's a secret term developed by today's drug subculture.