Question: how can you tell someone has been vaping?
Answer: Finding unusual or unfamiliar items. Vaping devices usually come with detachable parts. ... 
Behavioral changes, mood swings, agitation. ... 
Shortness of breath. ... 
Poor performance. ... 
Sweet fragrances. ... 
Weight loss. ... 
Nausea, vomiting. ... 
Mouth sores, abnormal coughing, throat-clearing.