Dealing with addictions when I beat it then it's switching to something else
Shit I'm only running from myself
But I'm.. running fast and I'm tired
Mac beats an addiction only to become addicted to something else, could be referring to more than just drugs.
When attempting to overcome addictions you have to overcome yourself as well, in which this case he is getting tired of trying to overcome and feels he will soon be overrun by himself.
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