Chemistry - Decomposition products of sodium acetate

Solution 1:

The fumes are likely to be acetic anhydride, as per this equation: $$\ce{2CH3COONa -> Na2O + (CH3CO)2O}$$ This smells like vinegar, and reacts with moisture in the air to give acetic acid.

Solution 2:

This link states that sodium acetate decomposes on heating to produce a white solid i.e sodium oxide, $\ce{Na2O}$.

The wikipedia link of sodium acetate and this link states that sodium acetate decomposes on heating to produce acetic acid fumes which have a strong vinegar like smell.