British man Abu Layth al-Khurasani was killed in the past few days fighting for Islamist forces in Syria.
His friends paid tribute to his "martyrdom" on Twitter and Instagram.
He sent his last tweet on January 30th, writing: "Turkey are now actively aiding FSA on the borders of Al Ra'i, there are two Turkish tanks guarding a checkpoint close to the town."
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The decision represents something of a victory for the president who will now be able to enforce most of his controversial 90-day ban.
Cool in the north, warmer air to the south
Police have warned the drug, known locally as "pink champagne", could be deadly.