The case echoes a wave of similar deaths in the United States that have been blamed on a product known as vitamin E acetate that is used a thickening agent in vaping oil.

"The link with the electronic cigarette is established. There is no other explanation for such severe pneumonia in this patient," Health Minister Maggie De Block said, when questioned in Belgian parliament.

The minister was questioned after several media reports announced the death on November 6 of Raphael, a Brussels resident, who had used an e-cigarette containing a cannabis derivative.

According to early findings, the product was cannabidiol (CBD), a popular and legal hemp component with mild soothing properties, but is also sold on the black market mixed with illicit and dangerous products.

"The investigation must continue to establish the precise circumstances" of Raphael's death, De Block said, who underlined the country's strict rules on vaping.

Health authorities in the US have classified vaping as "dangerous" for young people while the number of high school users increased almost twofold between 2017 and 2018.

US officials said on Friday they identified vitamin E acetate as the likely culprit behind a vaping-linked lung injury epidemic that has killed 39 people and sickened more than two thousand.

Vitamin E acetate is found in many foods and is also used in supplements and in cosmetics products like skin cream, but interferes with lung function when inhaled.afp