It's really not smoke but what is called vog. Volcanic gases. It's been happening in Hawaii and yes all islands for over 30 years. When the tradewinds die down it can be voggy. No way to tell more than a day or two out whether it will be voggy or not. We're at the mercy of the weather. All islands are fine to visit. Even the vast majority of the island of Hawaii where the volcano is located.
Also still closed on Kauaʻi is Hanaleiʻs Black Pot beach and the pier.
Rap them knuckles again, ms right.
If you're wrong, you're wrong, dear little fish :-).
Don't mislead people or post wrong info---then you won't get mad when someone calls you on it!
Welcome! I just want to bring to your attention that the Island of Maui has its own Forum (as do the other Islands). Much more specific information there ... lots of posts to read, as well as the Top Questions.
In the future, you'll want to post there. Go ahead and pull up the Island of Maui Forum and take a look. Right now, you're on the generic Forum for the entire State of Hawaii.