With smoking, you're inhaling poisons produced during the slow combustion of chemically-treated tobacco, which increases the risk of lung cancer and heart disease, even in nonsmokers.
With "vaping", you're inhaling poisons produced during the sudden heating of chemically-treated glycerin, which may contain toxic Diethylene Glycol (an ingredient in anti-freeze).
The symptoms of Diethylene Glycol poisoning typically occur in three characteristic intervals:
First phase: Gastrointestinal symptoms, such as nausea, vomiting, abdominal pain, and diarrhea, develop. Some patients may develop early neurological symptoms like altered mental status, central nervous system depression, coma and mild hypotension.
Second phase: In one to three days after ingestion (and dependent on dose ingested), patients develop metabolic acidosis, which causes acute kidney failure, oliguria, increasing serum creatinine concentrations, and later anuria. Other symptoms reported and secondary to acidosis and/or renal failure are: hypertension, tachycardia, cardiac dysrhythmia, pancreatitis, hyperkalemia or mild hyponatremia.
Final phase: At least five to 10 days after ingestion, most of the symptoms are related to neurological complications, such as: progressive lethargy, facial paralysis, dysphonia, dilated and nonreactive pupils, quadriplegia, and coma leading to death.
Is "vaping" bad for your health? Most likely, yes.
Will the people selling "vaping" oils and devices to kids tell you this? Most likely, no.
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The mere fact that science may not yet adequately explain an object, event, or experience does not mean the immediate explanation should automatically default to a conspiratorial, extraterrestrial, paranormal, or supernatural cause.