Don't want to sidetrack things but I'm trying to open up the usual meaning of addiction. I've seen too many people held captive by substances, sports, media, religions, whatever. While I believe our tendency to become passionate about anything makes up our humanity, they can all be taken to dangerous extremes. Enough years have passed that they all appear different shades of slavery to me. Some less immediately dangerous than others, but all with the potential. If we start legislating against addictions then an open analysis could endanger any activity that consumes, even those that promote natural stimulants. (endorphins, etc.)
So, I'm not suggesting you have addictions, just suggesting we be careful about labeling my gardening hobby more dangerous than your running hobby.