I burned too many Brain Cells down
To be worried bout my Brain Cells Now
Chance has smoked so much and done so many drugs he doesn’t care about the bad things they does anymore. It’s a vicious cycle as he becomes less averse to drug use and he destroys more brain cells.
It could be that the “Brain Cells” in the first line have a double-meaning; Chance could be talking about having freed himself from his own mind, which held him prisoner (“Cell”).
Symbolic of the fact that so many things have happened in his past that there is no point in dwelling on them or letting them hold him back.
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