My experience:
It's very silly to say that quitting weed is easy when you smoked it like for just 2 years and probably not every day/every time.
I've been smoking for about 6 years now and the last 5 years i've been stoned almost 24/7, i've done all my graduation using weed, i've studied using weed, i went to the class using weed, and mostly i did my job smoking weed.
What happens when you are so into it is very different when you are just not a heavy smoker, i call an heavy smoker anyone who smoke all day long, most of the days more than 6 times per day. When you smoke so much, for so long time, it's REALLY difficult to drop out the stuff.
You crave for it, every time. You don't have the motivation to do your stuff, you say to yourself you are going to stop, but every time you fail again, and again. Yes, it's very easy to drop anything in your life if you are not really addicted to it. Your mind convices yourself that you are going to buy again, but this time you are going to smoke less, you will control yourself, that's bs, not happening at all. I've been trying to drop it since nov/2015, and it's been a big novel, going back and forth. If you have a level so big of addiction you can't never in your life smoke it again, IMO, every time you smoke again, you will feel the craving symptoms again, it's like starting from zero point.
In the beggining i had the same kind of thinking like: "weed is harmless, it's natural, it can do any harm". And i agree at certain point; but like anything in your life, for those who overuse it can/will become a very big problem in your life. Just writing about it right now makes me feel a lot of desire to smoke it again.
Also, for who is struggling to drop out i can say that what has been more helpfull since i decided to really try to stop, and what made me even decide to stop was the meditation journey.
I'm sorry for my bad english.