CAN'T but do

[ademoglu]

Hi,

http://www.macmillandictionary.com/d...annot-help-but

- As I look back over my career, I cannot but smile.

This form is what I always see in dicrionaries. I would like to ask if we can use 'can't' instead of 'cannot.'

- As I look back over my career, I can't but smile.

Thank you.

[bhaisahab]

Yes, we can.