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In 1994, the former president disclosed that he had been diagnosed with Alzheimer's disease earlier in the year

But bronchitis, which results from inflammation in the tubes that carry air to your lungs, tends to be much less serious

Some studies demonstrated a higher risk of cancer in female users [odds ratio (OR) ranging between 3.2 and 45.89] compared to males in the same study (OR ranging from 2.7 to 9.33)

Awareness and use of e-cigarettes were higher among boys, in countries in Europe and America regions, and among those with higher income and restrictive policies, whereas it was lower in countries having the most restrictive policies

2012, 8 (5): e1002683-10.1371/journal.ppat.1002683

But other sources of stress can be long lasting and disruptive such as getting fired from a job, suffering a break up, or losing a loved one