Top alcohol makers have been sitting on the sidelines of a cannabis beverage boom, watching brands in the fast-growing category like Cann and Wynk make deals with beer and booze distributors and gain valuable space on liquor store shelves.

Now some alcohol companies, seeing their sales falter, are laying the groundwork to potentially enter the lucrative but risky market, a dozen founders of cannabis brands, ingredients suppliers and drinks manufacturers said.

Drinks containing THC, the mood-altering ingredient in marijuana, are restricted to licensed dispensaries in 24 U.S. states where recreational use of pot is legal. But small amounts of THC can also be extracted from hemp, a crop that's related to marijuana but is legal federally. Beverages containing THC derived from hemp can be sold in many liquor shops, convenience stores and supermarkets.