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then whats the difference between macbook air and pro?

It depends on what you mean by "smoothly" and "heavy user". These are incredibly subjective terms. The main difference is that the Macbook Pro is faster and it has a higher resolution display.
 
Probably not that heavy?

Heavy Photoshop user...

If you are considering the Macbook Air I don´t think you qualify as a "heavy user". Heavy users usually goes for 64GB+ ram and Mac PROs.

Editing 60-80Mpix images in 16bit tiff with 100+ layers and file sizes of 10GB+ won't work very well.

But for "normal" use, 20mpix, 16bit tiff, 10-20 layers and file sizes around 500Mb-2GB there will be very few problems.
 
What if am INDUSTRIAL user?

Those Kardashians need LOTS of retouching. :D

You're gonna need a few dozen clustered Mac Pros for that. ;)

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then whats the difference between macbook air and pro?

The difference is that on the MacBook Air, CS6 will run well. On a MacBook Pro, CS6 will run well, and faster.

If you're doing casual editing, or light mobile editing that will eventually be uploaded to a home/office desktop setup, then the MacBook Air should be great for this.

But if it's going to be your primary Adobe CS workstation, and you're going to use it exclusively and heavily, you should consider a MacBook Pro.
 
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