| http://www.w3.org/ns/prov#value | - Once tolerance happens, higher does become necessary to achieve the desired effect, and physical dependence develops.5 Chronic use may cause collapsed veins, infection of heart lining and valves, abscesses, liver disease, pulmonary complications, and various types of pneumonia.6 May cause depression of central nervous system, cloudy mental functioning, and slowed breathing to the point of respirat
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