Proof by anecdote, n=2.
I'm not saying you're wrong, I'm just saying that two stories have little statistical significance, if any at all. Taking life decisions based on such information is, in my eyes, unjustified.
Reliance on anecdotes is driven by paucity of statistically meaningful data. Reminding people that the former is not as good as the latter is unhelpful. Anecdata is still data.
It's like saying "Everyone I know who got suicidal depression consumed alcohol - better stay away from alcohol"
You'd be surprised how common it is for people to take THC in one form or another. It is literally meaningless to pull two stories together and derive a causation.
It's not at all proof by anecdote. He's saying that there's some evidence the two are linked, and that these anecdotes should remind us of this evidence and to use caution accordingly.