Concentration

I'm having a hard time concentrating today. Like a kid in desperate need of Ritalin, I am going back and forth between surfing the net, work, and taking breaks to smoke a cigarette. Even when I'm reading something online or work-related, I have no idea what I just read as my mind is just jumping from topic to topic every second.

Hope this isn't a sign of old age. Or all the years of chronic smoking is taking it's toll.