Answer by  
                                                                                          shashank (98)
                                                            
                          
                          
                                                          Yes extremely harmful. symptom of over inhaling are:Respiratory problems ie. breathing,Rash on skin due to contact,Irritation or burning in the eyes,Dizziness,loss of sensation in arms&legs,Rapid heart beat,Weakness,burning sensation,Nausea or vomiting.