Overworking a system won't cause overheating issues unless it's overclocked and/or insufficiently cooled. When using your laptop, make sure you have it resting on a hard surface (no carpets, chairs or bedding) and that it gets proper ventilation.
Also check for dust buildup, as has been mentioned. If you can, crack it open and check the heatsink on the graphics chip directly; in smokers homes or pet-ridden domiciles dust can build up between the fins, turning that big copper heatsink into a giant insulating blanket.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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