It depends on the gambler how he treats gambling. There are others who play for fun, so with this type of gambler, we can assume that gambling is a hobby for him, right?
But for a gambler whose aim is to make money, he/she cannot say that gambling is his hobby, especially if he already has an addiction to gambling that we know his body is looking for every day of his life.
Gambling is a dangerous hobby and should not be considered as such a thing because if we find it enjoyable this time, it can be changed once addiction comes. Many gamblers have started with such views, but later on, when greed has to arrive, we can no longer expect such views to be heard again. Instead, chasing is what is on their mind, and they spend more hoping they could win more. From simply saying "just for fun," now it turns into a "game of hell.".
That is why we don't take gambling seriously, and we limit our time as much as possible. Whether we agree or not, consistently losing is not fun anymore.