If you want to stop smoking pot, what is the best way to stop?

Probably just stop. There are many ways to do this and to fail at doing this, but the most common way people seem to quit is to just stop on your own. Apparently, up to three-quarters of ex-smokers of any substance report having quit without assistance ("cold turkey" or cut down then quit), and cessation without professional support or medication may be the most common method used by ex-smokers.