Don’t go chugging a shot of CBD oil just yet, though. Dr. Blessing said that much of the research is in its infancy, and the purity and dosage of some CBD consumer products may not reliable. And, she noted, CBD can have negative interactions with many medications, so potential users should talk to their doctors before taking it.”

There are legal hazards as well. As with all cannabis products, the federal government categorizes CBD products other than Epidiolex as a Schedule 1 drug, like heroin, according to the Drug Enforcement Administration. And cannabis remains illegal under federal law, even in states that have legalized marijuana for medical or recreational use.

Even so, the D.E.A.’s mission is to go after large-scale drug traffickers, not individual users, said Barbara Carreno, an agency spokeswoman. “We’re not swatting joints out of hands in Hilo, Hawaii, and we’re not going to focus on somebody who is buying lotion or ice cream that has CBD in it.”

Although there have been scattered raids of CBD retailers around the country, several states, including Alabama, Texas, Florida and Oklahoma, have passed laws approving specific CBD products to treat specific ailments. And CBD shops have cropped up nationwide, in Los Angeles, Oklahoma City and Austin, Tex., to name just a few cities.

In New York City, for example, CBD tinctures and other products can be bought at specialty shops, health food stores, yoga studios, flea markets, boutiques and even some corner delis. (The availability of CBD is perhaps not surprising, given Mayor Bill de Blasio’s continued efforts to reduce the penalties for low-level marijuana violations.)

Aside from a federal crackdown, the only thing that may eventually kill CBD’s momentum is hype itself, said Mr. DeLand of Dosist.