Smart work is just an add-on.
Hard work is the building block for the smart work. To do smart work one should have sound knowledge of the subject. This knowledge can be achieved only through hard work.
I believe that hard work is always productive — perhaps not in the short run. Rewards come to you when you are not chasing them blindly. When you set out to work with a passion to do your best, you will bring out the best in the others as well! That itself is a great reward.
These days, you’ll hear a lot of talk about working smart. People will often tell you, “You don’t get anywhere by sheer hard work. Look at the people working at construction sites. They are working very hard, but are they getting anywhere in life? If you want to achieve success, you need to work smart.” Such comments leave most of us in a confusion. What happened to the sayings like, “Work hard and the success will be yours”?
Actually hard work and smart work go hand in hand for you to be successful. As a conclusion, I can say that smart work is very important in today’s fast paced life. But to achieve that stage one should do hard work in the background.
Source : http://www.careerride.com/view.aspx?id=1104 . But I completely agree with these views.