I think that's a bit of a harsh take. People will use what they can get, and they may be assuming the signage was placed there for compliance/legal box-ticking reasons rather than because it will actually make them sick.
If you fail to heed a warning, though, the law provides that you assume the risk of injury that could result and contributed to your own injury. Without assumption of risk, anyone who provides any services would be strictly liable for any injury, even for those that don’t result from inherently dangerous activities. That would mark a significant change in the law and would suddenly make a lot of activities and services infeasible to provide.
