Yes, and also keep in mind that it has four perfect angles, formed so that it can spin like a frisbee in the air. This allows it to accelerate and be extremely sharp and dangerous whenever it hits its opponents.
The easiest way to use these are either a swarm of Shurikens, which act like little annoying bugs, and can easily block your opponents field of vision (as they will be focused upon these weapons coming at them), or to tie them upon strings and manipulate your opponents into being tied up in them.
They are light, easy to handle, and you can hold a bunch at once, unlike a kunai.
The next ninja tool is the smoke bomb.
Explain to me how you would use it in a battle and what it's prime use it for. Also, which Doujutsu can render it useless?