Kai is not that big of a drug addict, but he will do pot from time to time, not so much that he is needing it. The only thing that'll get Kai in big trouble is alcohol. Nya can't control him in a drunken state sometimes

Jay will drink from time to time and will smoke from time to time, mainly just to get away from the world when no one knows about it. He is not addicted to it

Cole is a alcoholic, not as bad as Kai. He does drink and uses a vape, mainly because he needs to not see the world at times or just to forget something

Zane is not a alcoholic or a drug user. He has thought about it once, but never actually tried it. He keeps everyone under control with their addictions, well, other then Kai

Lloyd cannot have drugs or alcohol, the ninja said wait till he is the MENTAL age of a teenager, since he has the mind of a 11 year old. Like he needs it anyway, candy IS his drug