If my ex struggled with addiction, is smoking weed again a relapse?

So, when we were together, he wasn’t smoking, and he used to struggle with addiction. I recently saw a video of him smoking pot again. I don’t want to see him suffer, but I don’t really know much about this. Is it bad that he’s smoking again? Could this mean he has fallen back into his old habits?

If my ex struggled with addiction, is smoking weed again a relapse?
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