No, but here he is trotting out the line about Schizophrenia, which is a real risk, but is dwarfed in its societal impact by the downsides of alcohol. I don't expect he's said anything at all publicly about the impacts of that though, which would suggest that he's the talking head that the German press always contact for a negative comment about cannabis every time it hits the news. Especially as this is reported by Die Welt which is an Axel Springer publication.