I live in the state of Oregon and cannabis is legal now as of July 1st. I can tell you that it's a huge sigh of relief. In Oregon you're able to possess up to 1oz on your person in public and up to 8oz in your residence. You are also able to legally have 4 plants out of public view at your residence. You can be ticketed for smoking in public though- smoking must be done on private property.
I've been using cannabis almost daily for over a decade and it feels amazing to not fear the police. Aside from weed I've never had anything to hide from law enforcement. Other than that it won't change much for me. I plan on keeping my same connection.
Employers are still able to drug test you despite it being legal at the state level because cannabis is illegal under federal law. Oh well, one step at a time. I think legalization is going to spread across the U.S. very quickly. It will be hard for states to say no when they see all the money cannabis brings in from taxes.