I don't think that's the kind of causal chain they are going for. Article seems to suggest that the depression comes from damage to the body from the particles.
I have a friend Galant who cleans his room everyday and has wealth and happiness. I have another friend Goofus whose room is a mess.
I'm not suggesting that the things in a room cause depression. Correlation tells you more than strict causation ever could.
An example:
Income is higher among vim users than eclipse users. Does that suggest anything to you?
It does to me, but that's because I'm willing to let the evidence shape my decisions. If I waited for strictly-causal proof then I'm leaving money on the table.
Another tip:
When will it stop being the case that vim users make more money than eclipse users? When evidence mounts and marginally push the lazy-about-evidence-people toward vim. By the time the last eclipse user switches away there won't be any more money on the table to take. Also eclipse will be dead by then.
Be greedy with evidence and lazy with your attachments, not the reverse.
