You can get mentally or emotional addicted to weed, but it is not a real physical addiction. You get addicted to weed because you enjoy the effects and want to experience them all the time, or you decide you cant live your life without it. That is not a real physical addiction. You body doesn't think it needs more weed, only your mind does. Alcohol is this way as well.

I really enjoy beer a lot. I don't drink it all the time, but it is most definitely my drink of preference. On a hot day there is nothing I enjoy more than an ice cold beer (although, as has been talked about before, most beers in America are not worth touching). I drink responsibly. I never get drunk when I drink, I never even get so much as a light buzz. Because that is not what I drink for. I drink because I enjoy the taste, not for the effects of the alcohol. So beyond any shadow of doubt, it is way more than possible to drink responsibly, people do it all the time.