Place cherry wood in a smoker or grill set to 225-250 degrees.
Place 1/3 of the cherries on a foil or baking tin. Smoke for 60-90 minutes.
In a large saucepan, combine all the cherries (smoked and fresh), sugar, and lemon juice. Heat on medium until the sugar is dissolved.
Reduce heat to medium-low and allow to simmer for 25 minutes.
Remove contents from heat. Cool for at least 1 hour.
Add cherry mixture to a lidded, glass container. Add whiskey. Seal tightly and store in a dark cool place for 12 weeks.