If you read the article, I believe it is more of a "we are studying it and there is a lot to do" than "drugs are good".

I think a very important part is:

> For example, I’m interested in the effects of THC versus CBD. We don't have any of that information in the UK Biobank. Most people in this study were using cannabis quite a while ago, and cannabis at that time looked very different from what’s available today. That context really matters. It’s a complex picture.