I took the liberty to look up the definitions for both Addiction and Obsession, and found that their meanings could be just as ominous describing as well as something positive.  After reading, decide under which label you would categorize yourself.  And, of course, let's consider the medical behaviors of sound mental rationale and cognitive reasoning, as long as such activities do not become life-threatening preoccupations and abnormal distractions.  
 
Addiction - 1 : the quality or state of being addicted
2 : compulsive need for and use of a habit-forming substance (as heroin, nicotine*, or alcohol) characterized by tolerance and by well-defined physiological symptoms upon withdrawal; broadly : persistent compulsive use of a substance known by the user to be harmful

*Addicted - 1 : *to devote or surrender (oneself) to something habitually or obsessively
2 : to cause addiction to a substance in (a person or animal)

*Obsession - *1 : a persistent disturbing preoccupation with an often unreasonable idea or feeling; broadly : compelling motivation
2 : something that causes an obsession

*In general, I believe it is more a compulsion, good or bad, that drives us towards being creative.  We find an interesting diversion, we develop it, and we turn it into something very much our own.  It takes the pressure off our everyday lives, and it mentally stimulates and challenges those brain neurons we, most often, take for granted.  Think for a moment, how many times you immerse yourself into a project without consciously thinking.