Answer
smoking
physical or emotional stress
drinking alcohol
allergies
fever or viral illness
antibiotics, cortisone, aspirin or other pain medicines
exposure to toxic chemicals (e.g., DDT, petroleum products, carbon monoxide), environmental pollution or heavy metals (e.g., lead, mercury, cadmium)
If you suffer from recurrent infections
If you’re a woman who takes the birth-control pill
If you’re older than age 60
All these things can cause a [...]
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