Excessive dosage can cause contact dermatitis, alopecia, abnormal perception, renal damage and liver abnormalities, and even popcorn pulmonary obstructive pneumonia.

About 8000 kinds of chemicals, artificial spices and spices are added to e-cigarettes, the most common ones are jasmine, oolong tea and watermelon. Zhao stressed that proper use will not cause serious harm to the body, and the flavoring agent contains "butanedione".