Instruct: Classify an Amazon review into positive or negative sentiment.
Query: toxic shelves... beware.

The design is awesome BUT... I installed 8 of these shelves in my bedroom and learned quickly that these shelves create an "off-gas" that is extremely poisonous. I lost most of my energy, became very unmotivated and had many bad symptoms. Read similar info here: [...]These shelves look great but are toxic. I would advise to steer clear from them until they are made out of 100% natural wood and no harmful chemicals. I have been breathing gasoline and formaldehyde as I slept for the past week and feel weak.I had no idea and wanted to spread the word so this wouldn't happen to anyone else.Mahalo