Everything that is done overly, that may lead to addiction will definitely affect our whole well-being. That is the reason why we should do things within our control, otherwise we will be force to do things that are not right and aren’t just. However, with investing addiction, provided that you are totally aware of its risks and you will only invest an amount that you can afford to lose, I think that is valid and reasonable as investing all in will be detrimental to your health if ever you lose them all in the end.
Investment addiction is not good because you keep increasing investment all the time even though you are willing to afford to lose, you may prioritize investment assets over real world assets and spend less on your needs, so it is not recommended in investing because you have to invest at a lower value reasonable and not excessive investing in fluctuating markets.