When did the Qing government first ban the sale and smoking of opium?

The Qing government first prohibited the sale and smoking of opium in 1729, during the reign of the Yongzheng emperor.1

While this initial decree aimed to curb the growing social and economic problems caused by opium addiction, it failed to effectively stop the trade. Consequently, the Jiaqing emperor later issued a decree in 1796 that specifically outlawed the importation and cultivation of the drug. Despite these repeated efforts by the Qing court to enforce restrictions, the trade continued to flourish due to smuggling and corruption, eventually leading to the Opium Wars between China and Britain.123