unless otherwise
You may smoke unless otherwise instructed. You may smoke unless instructed not to smoke. You can smoke “unless otherwise told”/“unless told not to smoke.” then: Unless “otherwise” = the opposite of “You can smoke”
You may smoke unless otherwise instructed. You may smoke unless instructed not to smoke. You can smoke “unless otherwise told”/“unless told not to smoke.” then: Unless “otherwise” = the opposite of “You can smoke”