be into something
be into something {v. phr.}, {informal}
To have taken something up partly as a nobby, partly as a serious interest of sorts (basically resulting from the new consciousness and self-realization movement that originated in the late Sixties).
Roger's wife is into women's liberation and women's consciousness.
Did you know that Syd is seriously into transcendental meditation?
Jack found out that his teenage son is into pot smoking and gave him a serious scolding.
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Source: A Dictionary of American Idioms