Only one week into Colorado’s history-making recreational marijuana industry, one shop has already sold out of pot, others fear they may soon join it and perhaps as many as 100,000 people have legally purchased marijuana at Colorado stores.

Industry advocates estimate Colorado stores have already done more than $5 million in sales — including $1 million on New Year’s Day — though National Cannabis Industry Association executive director Aaron Smith acknowledges those are “back-of-the-envelope” figures. The owner of one store said she expects to make as much in sales in the first 10 days of January as she did all of last year selling medical marijuana.

Read more: Colorado marijuana stores see steady business, dwindling inventory – Denver Post