Hmm, I think it's likely he was in a fairly active gambling environment, and his return to gambling is likely due to his inability to resist the temptations of his environment, leading him to relapse.
On the other hand, it's perfectly fine for him to return to gambling, but I'd like to ask: was he previously a legitimate gambler or a problem gambler? If he previously gambled legitimately, his return to gambling wouldn't be as prone to addiction, but of course, the possibility always exists.