Laptop Smoke: A Sign of Overheating and Potential Damage

[ElliottrEt]

What are the possible causes and consequences of laptop smoke emission?

 
I noticed a burning smell and a faint smoke cloud coming from my laptop after using it for a while. I turned it off immediately and cooled it down with a fan. The laptop seems to function normally now, but I am concerned about the potential damage or risk. The bottom vents of the laptop were obstructed and the laptop tends to overheat. What could have caused the smoke emission and should I be worried about it? How can I prevent this from happening again?
 
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