麻 (Kanji for mah jongg / ganja)

(literally this means "hemp" but 90% of the time, you'll see it on the store-fronts of ma jongg parlors!)

The former Japanese Prime Minister's name (Aso) is 麻生, which literally means, 'hemp life.'

Onyomi

Two trees stand in a cave playing MAH jongg.

麻雀(マージャン)	mah jongg ★★☆☆☆
麻酔(ますい)	anesthesia ★☆☆☆☆ 麻 (mah jongg / ganja) + 酔 (drunk) = 麻酔 (anesthesia)
大麻(たいま)	hemp ☆☆☆☆☆ 大 (big) + 麻 (mah jongg / ganja) = 大麻 (hemp)