Love = Drug??

I had someone tell me today that being in love, the mental state of it, creates a chemical reaction in the brain that is like a drug.... Now I trust this person very, so, this is something that I want to research a bit more, do some 'homework' on the matter/issue/idea.  My first impression of the idea is one of wonderment. Is it possible to understand such a thing? How to 'they'(the doctor's, all the phd folk) how do they know this info to be true? My contact says whole heartedly that it's true. Hmm, if that's the case then everyone is not getting the drug... If everyone was in the state of being in love, then everyone would be walking around on cloud nine wouldn't they? We know that is not the case... Interesting, how does one maintain the 'being in love' mindset? How does one create an enviroment that will be a help, not a hinder in the culltivation of such a state? How does one get out of that state if it is not wished? Or how does one get out of 'being in love'? There are times that people are in love with someone and that person does not know it, there ar time one does know but does not feel the same and there are times when two people actually do love each other but can't seem to 'find their way' to each other... If love is a drug, then how does one know how good it is and is there anyway to test it before 'buying in'? I am wondering about all this, right now... hehehe I guess I should do some research and then post again.. Take care world... Think good thoughts da!!