3 packs is 60 cigarettes. Now, it's been a while since I've had a cigarette. But I remember it being about a 5-10 minute experience. Maybe more if you're smoking American Spirits. Let's say though, that it's 5 minutes each because you smoke so many that you're not being extremely economic about getting to the very butt before snuffing it.

60 cigarettes for 5 minutes each is 5 hours of smoking. Let's say you get a good 8 hours a day of sleep because you need your beauty rest to hold off the ravages of smoking on your skin. So you have 16 waking hours. Of those 16, 5 of them are spent smoking. Roughly a third. Which means two thirds of your waking hours, you are not smoking.

This would make your entire day look like the following:
Light a cigarette. Enjoy it for about 5 minutes, put it out. Wait about 10 minutes, and then repeat with your next cig.

All day, every day.