Soak 16 wooden skewers in water for 45 minutes to 1 hour.
Cut the salmon filets into 1 inch cubes and slice the lemons as thinly as you can.
After the skewers have soaked, take 2 skewers at a time and start by skewering both skewers through one piece of salmon. Then fold a lemon slice in half and skewer it on top of the salmon. Alternate salmon and lemon, ending in salmon (5 or 6 pieces of salmon total per kebab)
Drizzle kebabs with olive oil and sprinkle with oregano, salt and pepper on both sides.
Heat grill over medium-high heat. Once heated, spray grates with non-stick spray.
Place the kebabs on the grill on an angle to get good grill marks. Grill for 4-5 minutes with hood closed.
Open hood, flip skewers and cook with hood closed for another 3-4 minutes.
Remove from grill, squeeze lemon juice over the top and serve.