Is hook_init() the best place to add the CSS and JS?

I was looking at the text_resize.module, and I noticed that all the CSS and js is being added through text_resize_init(). But that means that the CSS and javascript will be added on every page, regardless of whether the block is on a given page or not. Pages without the block are getting unnecessary css and js overhead.

It may be better for those to be added in text_resize_block() (where $op == 'view') so that they are only loaded when needed.