What Caused the Spontaneous Fracture of an Ashtray with Lit Cigarette Buds?

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An ashtray on a balcony unexpectedly fractured into four pieces while containing lit cigarette buds. The incident raises questions about the possible causes of spontaneous glass breakage, particularly under the influence of heat from the burning cigarettes. The discussion references existing scientific threads that explore similar phenomena and suggests researching "spontaneously shatter" for more insights. Factors such as thermal stress or flaws in the glass may contribute to such occurrences. Understanding these mechanisms is crucial for preventing future incidents.
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We have an ashtray on an elevated table in our balcony.

No one was outside and it suddenly fractured into 4 nearly even pieces on the table. Strangely enough, all the cigarette buds were lit.

This is the ashtray we used:

http://www.walmart.com/ip/Anchor-Hocking-5.75-Glass-Ashtray/17693180

My question is, how do you think this thing suddenly broke with all the cig buds lit?
 
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