Smoke cherries for about 2 hours using your preferred method of smoking. Add 1 cup of cherries (setting aside the other cup for garnish), sugar, and ½ cup of water to a saucepan. Bring to a boil, then reduce to a simmer. Once sugar is melted, remove from heat, smash cherries with a fork, and allow syrup to sit, covered, for 30 minutes. Strain syrup into a clean container and store in the fridge for up to 1 week.