Not much errors, though. But you could put some spaces after most of your dialogue tags before continuing the next line of action.

Then, here are some things I can readily point out:

They can never understand; I did all this for them, he said as he lit another cigarette and inhaled.

In the above, you didn't put the dialogue in inverted commas.

Her eyes were dilated and red..

It would sound much better if you say "her eyes dilated, and turned red."

She bite the under of her lips..

The right verb to use above will be "bit"