Citation please.
EDIT: found the case and also this:
"Researchers in Düsseldorf, North-Rhine Westphalia, claimed to have discovered the first cannabis-related deaths after performing a post-mortem examinations on 15 people whose deaths were linked to the drug.
They believe two of those deaths could not have been caused by anything other than cannabis, according to a study published in Forensic Science International this month under the title
“Sudden unexpected death under acute influence of cannabis”.
But on Wednesday the German Association for Drugs and Addiction (FDR), which is based in Hannover, told The Local the study did not help educate people about the dangers of the drug.
“Cannabis does not paralyze the breathing or the heart," head of the FDR Jost Leune said. "Deaths due to cannabis use are usually accidents that are not caused by the substance, but to the circumstances of use.”
Leune added the dangers of marijuana were “exaggerated” and it was less harmful than alcohol or tobacco."
https://www.thelocal.de/20140226/german-doctors-claim-cannabis-can-kill