Everything in moderation, and hobbies are healthy.
The problem with gaming is it can easily be overdone. IMO, this is where you have to know yourself. In my past, I was gaming for well over 30 hours a week. That is a job. It's so easy to lose yourself. Start your favorite video game in the morning. The hours will fly by, and the next thing it's 10pm. I've had so many of these experiences. My favorite games back then were RTS, FPS, RPGs, and sports. For example, I would play Skyrim for hours on the weekend. I'd lock myself in my apartment and play until nightfall. Totally unhealthy in so many ways. I did this in the summer. Instead of going to the beach with my friends I'd game in my air conditioned apartment. I missed out on so many life experiences. I soon lost all of my friends and even lost a few girlfriends to gaming. I had an addiction that I needed to resolve.
I've since gotten rid of my games. I don't play anymore. That includes smartphone gaming which for me is another issue. I've wasted so much money on IAPs it's embarrassing. So, I've stopped altogether. I drew the line in the sand and I've decided to engage in other activites like going to the gym and reading great informational books like FREEWILL by Sam Hartris. Great book by the way. I meet so many young people who do nothing but game. IMO, that is a mistake becauase they are missing out on life experiences. You don't want to have that regret you wasted your youth on video games. Amazing life experiences are why we are on this planet. It's not to be locked up in some room playing hours and hours of video games. So yea, gaming can be like a job if you overdo it. Gaming is awesome if you can not let it affect your life. In my case, I had to let it go.