Yes, this idea is inspired by Lost. It's pretty much self-explanatory. The smoke monster would be a cloud of black smoke about 6m long. It would spawn in the Nether, and be able to travel to the normal world via portals. Alternatively, it would spawn near fire and lava. It would attack by sending its victims into the Nether.
(Sorry about my poor sentence structure, I just got a nasty papercut on my right index finger and it's making it a pain to type.
Blarg. If your gonna have a black fog monster, and your having the idea similar to one in another series, and it appears in the nether, don't waste it on Lost's! Use Machin Sin off of the Wheel of Time! Its scarier, its deadlier, its more fitting for "hell", etc., etc. .
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~ I've thought about the phrase 'Money is the root of all evil' and I have to disagree. Evil isn't dependant on an object. I say that want is the root of all evil.