WALLED LAKE, Mich. (CBS Detroit) — An Oakland County marijuana dispensary is hoping to kick start blood and plasma donations in Michigan in response to a nationwide shortage.

The Greenhouse of Walled Lake is giving away a free pre-roll to anyone who shows they donated blood or plasma.

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The “Pot for Plasma” initiative runs from Jan. 18 through Feb. 27. Anyone age 21 and older are eligible as long as they show proof.

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Click here for more information about the promotion.

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To donate blood, visit the American Red Cross website.

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