The state Bureau of Cannabis Control, which oversees the market, has said the proposed rule is merely clarifying what has always been the case: A licensed pot delivery can be made to "any jurisdiction within the state."

A proposal in the Legislature intended to clarify that a licensed business can deliver cannabis anywhere in California stalled in the Senate. Meanwhile, online directories like Weedmaps advertise delivery services — some legal, some not.

In general, California treats pot like alcohol, allowing people 21 and older to legally possess up to 1 ounce of the drug and grow six plants at home.

California's legal market has gotten off to a bumpy start. Illicit sales are still thriving, a shaky supply chain has customers looking at barren shelves in some shops and there have been complaints about testing and hefty taxes.

In fact, an increasing percentage of high school kids — at least 26 percent of seniors in 2014, up from 5 percent in 1976 — are abstaining from all substances, including alcohol, marijuana and tobacco, according to an historical analysis of the survey data published in July.

Even so, addiction practitioners say they’re seeing a surge in the number of young patients who are hooked on Xanax. Many take high daily doses of the drug, sometimes in deadly combination with opioids and alcohol.

Addiction treatment centers are “the tip of the spear,” said Sharon Levy, director of adolescent addiction treatment at Boston Children’s Hospital and lead author of the adolescent drug use study. “We see things first. So, I’m not surprised that the spike in Xanax use isn’t reflected in national data yet.”

But no medicines exist to blunt the withdrawal symptoms and cravings associated with benzodiazepine addiction. Instead, patients typically enter residential treatment where a specialist gradually tapers them off the medication. If stopped too quickly, benzodiazepine withdrawal can result in seizures and even death.