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A transformer exploded at a factory that makes tank engines in Chelyabinsk, Russia.
(streamable.com)
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Not sure this has been the official "explanation" this time, but looking at it from a technical side, there isn't normally anything in a transformer flammable enough to be ignited by a cigarette, even if you could drop it directly into the cooling oil (which you can't: they are normally sealed). My understanding is that you need a sustained arc over several minutes of "normal" electric current, or several lightning strikes to heat up the oil enough to catch fire. That requires some major fault. I guess a suitable type of warhead could cause it eventually, but not immediately.
Normally
I wouldn't be surprised if the issue turns out to be a comedy of errors.
Neither would I. Just saying that "smoking at the workplace" alone won't suffice. Unlike in, say, a ~~fireworks~~ munitions factory.
Well of course there is rules, and there are is what people do.
Paying attention is important.