From Chapter 4:
Whether the use of tobacco prevailed as generally among the Cavalier forces is less certain; but as King Charles hated the weed, courtiers may have frowned upon its use. One distinguished cavalier, however, either smoked his pipe, or proposed to do so, on a historic occasion. In Markham's "Life of the Great Lord Fairfax" there is a lively account of how the Duke, then Marquis, of Newcastle, with his brother Charles Cavendish, drove in a coach and six to the field of Marston Moor on the afternoon before the battle. His Grace was in a very bad humour. "He applied to Rupert," says Markham, "for orders as to the disposal of his own most noble person, and was told that there would be no battle that night, and that he had better get into his coach and go to sleep, which he accordingly did." But the decision as to battle or no battle did not rest with Prince Rupert. Cromwell attacked the royal army with the most disastrous results to the King's cause. His Grace of Newcastle woke up, left his coach, and fought bravely, being, according to his Duchess, the last to ride off the fatal field, leaving his coach and six behind him.

From Chapter 5:
The year 1660 that restored Charles II to his throne, restored a gaiety and brightness, not to say frivolity of tone, that had long been absent from English life. The following song in praise of tobacco, taken from a collection which was printed in 1660, is touched with the spirit of the time; though it is really founded on, and to no small extent taken from, some verses in praise of tobacco written by Samuel Rowlands in his "Knave of Clubs," 1611:

To feed on flesh is gluttony,
It maketh men fat like swine;
But is not he a frugal man
That on a leaf can dine?
He needs no linnen for to foul
His fingers' ends to wipe,
That has his kitchin in a box,
And roast meat in a pipe.
The cause wherefore few rich men's sons
Prove disputants in schools,
Is that their fathers fed on flesh,
And they begat fat fools.
This fulsome feeding cloggs the brain
And doth the stomach choak
But he's a brave spark that can dine
With one light dish of smoak.

There is nothing to show that King Charles smoked, nor what his personal attitude towards tobacco may have been.