Does everyone that tries cigarettes become a smoker? Absolutely not...some try it and dont like it and dont get addicted.
Does everyone who drinks become an acoholic (chronic user). Absolutely not.
There might be an upswing upon legalization but pot isnt for everyone....if it was, believe me, more people would smoking it now. It's available easily in most states. Not everyone will use pot, just like they dont now...just like everyone is addicted to cigarettes or booze.