Smiley was created by gathering and compressing the poisonous H2S gas that Caesar Clown spread throughout Punk Hazard as retaliation for being fired.
At some time, Smiley consumed the Sara Sara no Mi, Model: Axolotl, which allowed it to take on the form of an axolotl and also gave Smiley some sort of life and sentience. However, given its unique composition, it is very likely that it could only assume a hybrid form and not a full-beast form.
Eventually, Smiley "died" as he exploded and collapsed back into his original gas form.
A nearby apple was then seen transforming into a Devil Fruit, which was an indication of Smiley's "death".
Source: Chapter 669 - Caesar explains how Smiley was created, Chapter 676 - Smiley dies and the Devil Fruit "transfers" to a nearby apple
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