This discussion is not about gambling, it is about investing, but I will use gamblers to make an example.
Using gamblers as an example who start out with just the intention to have fun maybe and then along the line turn into addicted gamblers that gambling begin to affect other areas of their life like their wellbeing like they stop spending on some important things just so they can make money available for gambling. Now talking about investing, I think it is possible to become addicted to investing so much that it begins to affect your wellbeing, like the person stops spending on other important things like good food, good clothes etc. just so they can have more money to invest? Do you consider that kind of addiction dangerous and not good?
It always comes down to how you see things. As how you explained it? there is nothing wrong. But when share your insight how you see it, it gets worse. If you see investing in that way, you will absolutely lose money because you will fight your own belief about investing that you won't be able to follow your plan.
I advise that if you would invest, make sure that it won't affect or downgrade your day-to-day life. It should be something that gives you assurance that in the long run, it will serve as your safety net as you hedge on an asset over inflation. It just falls into your mindset and how you see it.
Investment is good if you use it wisely. And you can only use it wisely if you see it as a good thing and not as a form of addiction.