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AIDS is the most advanced stage of HIV infection

Tension headaches don't usually cause nausea, vomiting, or light sensitivity

But if it happens over and over, the arterial walls can become permanently damaged, and that damage can cause blood clots, heart attack or stroke

The form and concentration: How long nicotine stays in your system may depend on the type of tobacco product you use

Observe Others: Observing where other smokers are congregating can also serve as a guide

however, smoking and mastery are more novel prognostic factors that are not well accounted for in current clinical practice," Colman said in a statement.