So many apples
I mean, that depends on what you consider to be 'good.' Do the positives it provides outweigh the ramifications that come with its use? In most cases I've witnessed, the answer is 'yes,' so I'd say that it's good in that regard. It's no worse than television, just another source of entertainment, and the impact on one's health doesn't appear to be any worse than that of countless other things we do or ingest on a daily basis. It's not really one of those things that I'd lump into a good or bad pile, it's somewhere in between in that grayer area which is why legalizing it for recreational use has been such a struggle: no matter how much there is to support its legalization, there's still just as many of the issues that're still holding it back, and no amount of research will nullify those points. Until they have so much evidence in support of cannabis use that it outweighs and overwhelms the negative aspects of its legalization, people like myself will be stuck doing what we love in the shadows.
Legal or not, like you said, it's everyone's personal decision to use or not use. However, imagine being a businessman. Due to a good year, you and your company, as well as your businesspartners decide to celebrate. You have to show up because you are a part of the company. Unfortunatly, you can't handle alcohol and generally avoid tobacco smoke cause you tend to get headaches from tobacco smoke and it makes you feel sick. While all others are enjoying their right to intoxicate themselves, you start to feel out of place and can't quite get with the mood. This harms your relationship with fellow partners and workforce. Why can't you enjoy something less harmfull, something with less consequences? Why not enjoy a single joint for the whole evening and not feel bad about it?
I don't know, I'd personally feel like a second-class citizen if I could not make use of my right to intoxicate myself. If I had the option to intoxicate myself, it would at least make me feel better about it, without having to be paranoid about legal issues and social stigma.
See, that doctor person in the video was scared because companies would advertize it. And with a consumer oriented social structure, it would be no wonder if a lot of people would get addicted. It needs to be regulated, just as alcohol/tobacco is regulated. Other than that, I don't see why it shouldn't be legalized. You can't drink and drive, so obviously you can't smoke a joint and drive ( just incase you ever wondered ) and consuming too much of something always leads to shitstorm ( yes, food, sweats and even an overdosage of WATER can fuck you up ).