Justin Bieber's been well-stocked on weed for a year -- and there's picture proof.
TMZ has obtained multiple photos of Justin's kitchen taken at the beginning of 2013 ... when Bieber was 18.
The photos show an elaborate weed set-up -- including a bong, a substantial amount of weed, and other paraphernalia.
TMZ published photos of Bieber holding a blunt in January 2013 ... the first pics ever of the singer toking what appeared to be weed.
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