Pob tshab iav ashtrays nrog cov yeeb yuj tsos zoo nkauj heev, tsis tsuas yog siv tau heev tab sis kuj yog ib qho zoo nkauj hauv tsev thiab chaw ua haujlwm.Muab tso rau hauv chav nyob, kawm, chav sib tham yuav cia cov neeg tuaj saib xav tias tus tswv tsev zoo nkauj zoo nkauj.