The first wave of patients to take advantage of Arizona’s new medical marijuana law may be compelled to apply for home-growing operations because the drug will not be available in licensed dispensaries until late summer, opening the door for thousands of household marijuana gardens.

Arizona’s medical marijuana proposition is still losing by more than 3,300 votes, a gap that has stayed relatively steady over the last 24 hours. But it’s still too close to call Proposition 203, as 78,000 early and provisional ballots remain to be counted.

If voters say yes, the operators of the first medical marijuana dispensary say they can open the doors a day after the election.

U.S. Sens. John McCain and Jon Kyl led a group of Republican officials Wednesday denouncing a ballot measure that would allow medical marijuana.