I’ve known a few people who do very low stakes gambling for fun. It might be something as simple as pitching pennies, buying an occasional scratch off ticket or a silly Super Bowl bet on who’s paying the pizza delivery tip. I don’t consider those activities to be a sin.
On the other hand, I have a friend who basically lost everything due to a gambling addiction—twice, actually. He literally couldn’t play a round of golf with me and friends without letting something “ride” on a hole or whatever. After a couple of years, I learned that I had to tell him that our bets couldn’t be more than a quarter on whatever he wanted to bet on. Worst case scenario, someone might end up owing $5 by the end of a round. If I left it up to him, he might end up paying me $100 or more (I was a better golfer).