Well, another W for you.

Although, coffee is much less harmful than nicotine, and its consumption doesn't have other negative health effects that arise from inhaling toxic smoke.

At the same time there are clear benefits of coffee usage. So, depending on the perspective, addiction and overconsumption aside, you could consider coffe to be a net positive. Thus, from my point of view, it's your loss, mate. Hopefully you still get something done in the morning. If only we knew what you'd be capable of if properly coffeinated.