Passage: Smoking has been shown to be an independent risk factor for MS.  Stress may be a risk factor although the evidence to support this is weak. Association with occupational exposures and toxins—mainly solvents—has been evaluated, but no clear conclusions have been reached. Vaccinations were studied as causal factors; however, most studies show no association. Several other possible risk factors, such as diet and hormone intake, have been looked at; however, evidence on their relation with the disease is "sparse and unpersuasive". Gout occurs less than would be expected and lower levels of uric acid have been found in people with MS. This has led to the theory that uric acid is protective, although its exact importance remains unknown.

Question: What are other risk factors of certain Vaccinations?
diet and hormone intake