I found an interesting analogy with smoking and running. When a person is addicted to smoking, this is how he describes:

I feel like smoking when I feel bad, when I feel good, when I feel sad without any obvious reason, when I feel successful, when something great happens to me, when I’m in a very strenuous situation, when it is raining outside, when it is sunny outside, when there is a storm going on, when it is a dull day, when it is a windy day, when I feel bored, when I have too much task to handle, when I feel burnt with my work, when I don’t feel like working, when I’ve eaten too much, when I’m hungry, etc…

Now the interesting part is, it all applies to me when you replace ‘smoking’ with ‘running’.

I can now officially call myself a running addict. :P May be it is the runner’s high that I seek each time I hit the road.