Read Alex Kozinski and Misha Tseytlin's classic essay "You're (Probably) a Federal Criminal" – http://alex.kozinski.com/articles/Youre_Probably_a_Federal_C... - in the US, there are so many federal crimes, so expansively defined, that almost every adult has probably committed at least one, and the only thing keeping them from prison is that they aren't on some prosecutor's hitlist. And I don't think this is an exclusively American problem either, it is a problem in many other countries too.

The majority of Americans have smoked pot, are a majority now criminals?

Most people are not cops either. Most cultures (aside from some sometimes vocal subcultures) do appear to consider their abuses unwanted anomalous behaviour.

Most people are breaking some law, it just depends how vigorously we want to enforce the law against you.