I thnik hobbies which give you feelings that you want the most but can never get from your daily routine,  such as something that can get you out of  the life you don`t want(even just for a little while),  turn into obsessions very easily.
 

With me - EVERYTHING!

I am in love with life and so everything becomes an obsession for me, until I have thoroughly understood it!

I guess that makes knoweldge and learning my obsession!!!!!!!

i think internet.

 internet for me too