What is the ruling on smoking during the daytime in Ramadan, and is it considered one of the things that invalidate the fast or not, as some say it is neither eating nor drinking?

Shaykh Ibn Uthaymeen holds that smoking in Ramadan invalidates the fast of the one fasting, because smoke reaches the stomach and the internal cavity, and anything that reaches them is an invalidator of the fast, whether it is beneficial or harmful. It is not a condition for an invalidator of the fast to be nourishing. He also believes that the month of Ramadan is an opportunity for smokers to rid themselves of this bad habit, as they abstain from it during the day. At night, they can occupy themselves with what Allah has made lawful of food, drink, and worship, and avoid bad company. If they abstain from it throughout the month, that would be a great aid in abandoning it for the rest of their lives.