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That leads to problems like coughing, bronchitis, and pneumonia

They havent been studied in a rigorous manner. Rizzo also notes that studies on e-cigarettes are especially challenging due to difficulties in making direct comparisons

Finally, the animals were euthanized at the end of the experiment under deep anesthesia by intraperitoneal injection of ketamine/xylazine followed by intravenous injection of KCL (149 mg/ml, 0.5 ml/250 gm body weight) to stop the hearts in a relatively diastolic or relaxed state

It is actually quite common and is done for a number of reasons, none the least of which is saving wire and fusesit is possible, but it doesnt necessarily mean the electricians were drunk and disorderly