smoking damage

So I have had my computer for over 6 years, upgrading different components throughout the 6 years. I was sitting at my computer watching YouTube videos today and my mouse started disconnecting, and suddenly started producing smoke (from the wire just above the mouse). I also got a notification...

I have had a Macbook Pro Laptop for 7 years now, and recently it has begin to act unbelievably slow and buggy, especially when online, which concerns me because I am a heavy smoker, and have not been regularly cleaning the laptop.... Has my smoking destroyed the computer somehow, or is it just...