Fill a chilled copper mug with ice.
Add vodka, lime juice and CBD-ginger syrup with ice and stir.
Top with ginger beer.
Garnish with a mint sprig and lime wedge.
*CBD-ginger syrup: Bring 1/2 cup water to boil in small saucepan. Add 1/2 cup sugar and stir until dissolved. Add 3-inch stem of fresh ginger and 2 g ground decarboxylated dried cannabis (CBD) flower**. Cover and reduce to simmer for 30 minutes. Remove from heat and let cool. Strain through cheesecloth into jar and seal. Store in refrigerator up to one month.
**Decarboxylate dried cannabis (CBD) flower: Loosely break up cannabis flower and place on rimmed baking sheet. Bake at 240 degrees F for 30 to 40 minutes. Set aside and let cool.