Thirteen-year-old Danielle Lei set up her cookie stall outside of the clinic in San Francisco and was welcomed by patients and staff. 

Danielle sold out of her first batch within 45 minutes, according to the clinic, which is a fully licensed dispensary serving qualified California patients.

The Green Cross wrote on Facebook: "When the Girl Scouts set-up shop outside The Green Store storefront yesterday, little did they know they'd need to call for back-up Girl Scout Cookies after 45 minutes!

"It's all about location and it's safe to say this one was a great success."

Danielle has until 16 March to sell 1,200 boxes of the Tagalongs and Thin Mints biscuits and half of the proceeds will go to charitable organisations related to Alzheimer’s.

Her choice of location was approved by the Girl Scouts of Northern California, who said it was not up to them to decide where the cookies could be sold.

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Dana Allen, director of marketing and communications for Girl Scouts of Northern California, told Mashable: "We're not telling people where they can and can't go if it's a legitimate business."

Holli Bert, a Green Cross employee said she was not surprised by the volume of biscuits being sold. "It's no secret that cannabis is a powerful appetite stimulant, so we knew this would be a very beneficial endeavor for the girls," she said.

"It's all about location, and what better place to sell Girl Scout cookies than outside a medical cannabis collective?"

The cookie stand proved so popular Danielle and fellow Girl Scouts were invited back the following Saturday.

Daniellie's mother Carol Lei told The East Bay Express she allowed her daughter to sell the cookies there because she believes it will help teach her the difference between using cannabis recreationally and medically. Both Danielle and her sister Nikki have sold biscuits outside other marijuana clinics before.

“They learn that they’re not drugged out,” said Ms Lei, who supervises her daughter as she sells the cookies. “Many have serious needs, and are just a little different.”