Professional poker players will use Beta blockers. Not valium. This man doesn’t sound like a pro player. He sounds like a loser from the moment he inherited his money or hit a lottery jackpot.
Diazepam is not addictive as in the sense of opiate addiction but certain types of benzodiazepine if taking for a very long time need to be weaned off with diminishing doses over a period of time or you will have palpitations, sudden irritability and possibilities of seizures.
I wasn’t thinking he might get an adrenaline flow from playing poker but going full auto will definitely pick up one’s heart rate.