Only if that quest yields more Gwent cards.
Yeh.
Geralt is approached by a doctor who is acting on behalf of his friends, calls it an intervention.
Agree to explore it and the doctor invites you to his house to talk, where he explains through a series of questions and metaphors of the impact Geralt's addiction is having on those around him, how many of the players he faced said nothing of the fact he refused to put his own cards up to stake as they feared for their lives.
Geralt slowly realises what his addiction has done, how he's become the very thing he despises. He breaks down, he gives up his Gwent cards and thanks the Doctor for his help.
Later that day he hears of the winner of a Gwent tournament, he recognises the name of the local doctor. He sneaks into the doctors office and uses his Witcher sense to listen in, he overhears him speaking to a friend how the entire thing was a scam and how he fooled the stupid Witcher into giving up his prize cards.
Geralt confronts him. The doc pisses himself. Geralt gets his cards back along with the cards the doc won in the tournament.
He leaves, admiring his new cards but with a strange sense of emptiness.