"Tobacco" is "구름과자"(ku-rŭm-gwa-ja) in Korean.
Korean slang of tobacco, 구름 과자 (gu rum gwa ja).
It is combined word of 구름 (clouds, gu rum) and 과자 (gwa ja, sweets), which means 담배 (Dambe, tobacco).
Among young people, words that are used as slang for cigarettes (담배, Dambe).