No safe level of anything
Almost (maybe actually) every activity carries risk. Quantifying risk relative to sitting in a chair, wrapped in a duvet and sipping cooled boiled water is a nonsense.
But there does seem to be a section of the public health lobby who seem determined to view any low risk that gives pleasure as unacceptably high. As in saying a glass of fruit juice shouldn't be 1 of the 5 a day because of its sugar content.