The ash left after tobacco burned was no different from wood ash. After all, tobacco was made from plants too.
But the smoke exhaled was different from the smoke produced by burning wood.
One of Cassino's books recorded an extremely dangerous smoke that required dragon cheese, the stems of death cap mushrooms, and black toad saliva.
Even a little of this spray could cause "lividity" to appear on an enemy's body, but the user first had to take a deep breath of it, just as Grindelwald had done in the Lestrange Family Cemetery in Paris—drawing deeply from the Skull Hookah before exhaling the "smoke."
If the user accidentally inhaled the spray, they would be poisoned as well.
Pomona covered the reader's eyes with both hands.
Rather than getting angry at her for interrupting his reading, he asked with a smile, "Do you want me to guess who you are?"
"Trick or treat," she whispered in his ear. Her breath stirred the hair beside it, and merely looking at it made her feel itchy.
"It isn't Halloween."
"But I want some sweets." She spoke softly. "Do you think we should go to Honeydukes or Weasleys' Wizard Wheezes?"
He caught her hands and guided her onto his lap.
"Weasleys' Wizard Wheezes only has Skiving Snackboxes. Which class do you want to skip?" Severus said.
Pomona noticed the scar on his neck and shifted her gaze to his eyes.
"Honeydukes and Zonko sued George. It seems to be over copyright infringement."
"What does that have to do with us?"
She pinched the nose of this habitual offender.
"You taught them."
He looked even more unconcerned.
"Toots didn't sue you, even though you deciphered his secret formula and taught it to the students."
"So I should thank him?" Severus sneered.
That was it. That