Posted By Paul Craythorne Lawrence, Your duties under the law with regard to smoking in the workplace extend to providing suitable arrangements in rest rooms and rest areas to protect non smokers from the discomfort caused by tobacco smoke as stated in regulation 25 of the Workplace (Health, Safety and Welfare)Regulations 1992. Other duties would be where you have designated an area as 'No Smoking' for safety reasons such as an explosive atmosphere or flammable substances etc. In both of these cases it would be your duty to inform your visitors of these obligations. However, if you have made your entire workplace a non smoking facility then surely it would be a good idea to inform visitors of this ruling. Regards, Paul Craythorne