The tax will almost double to 1,050 won (6.12 yuan) per milliliter from the current 525 won. 

According to the Ministry of Health and Welfare, the cabinet has recently approved changes to the National Law on Health Promotion, which will take effect on January 1, 2021. 

Administration officials say the changes aim to impose a fairer tax on different types of tobacco products.Currently, e-cigarettes are taxed at 43 percent of the rate of traditional cigarettes.