Why is my debounce not working properly?

This script creates a fireball and launches it from your hand. It works great, but I'm having a problem with the debounce. If I press Q once and launch one fireball, the debounce waits three seconds like it should, but if I press Q multiple times, a bunch of fireballs will launch, and then wait. What am I doing wrong?

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()
local Debounce = true

local UIS = game:GetService("UserInputService")

UIS.InputBegan:connect(function(Key, GPE)
	if Key.KeyCode == Enum.KeyCode.Q and not GPE then
		if Debounce == true then
			
			local Animation = Player.Character.Humanoid:LoadAnimation(script.Animation)
		    Animation:Play()
		
		local Part = Instance.new("Part", game.Workspace)
		Part.CFrame = Player.Character["Right Arm"].CFrame * CFrame.new(0, 0, -2) 
		Part.Anchored = true
		Part.Transparency = 1
		Part.CanCollide = false
		Part.Size = Vector3.new(0.8, 0.8, 0.2)
		
		Player.Character.Humanoid.WalkSpeed = 0
		
		local Decal = Instance.new("Decal", Part)
		Decal.Texture = "rbxassetid://301362847"
		local Decal2 = Instance.new("Decal", Part)
		Decal2.Texture = "rbxassetid://301362847"
		Decal2.Face = "Back"
		
		for i = 1, 11 do
			Part.Size = Part.Size + Vector3.new(0.5,0.5,0)
			wait()
		end
		
		local FireBall = Instance.new("Part", game.Workspace)
		FireBall.CFrame = Part.CFrame * CFrame.new(0,0,-3)
		FireBall.Transparency = 1
		FireBall.Size = Vector3.new(1.2, 2.4, 0.8)
		
		local Sound = Instance.new("Sound", FireBall)
		Sound.SoundId = "rbxassetid://182382770"
		Sound:Play()
		
		local Fire = script.ParticleEmitter:Clone()
		Fire.Parent = FireBall
		
		local BodyVelocity = Instance.new("BodyVelocity")
		BodyVelocity.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
		BodyVelocity.Velocity = Mouse.Hit.lookVector * 80
		BodyVelocity.Parent = FireBall
		
		FireBall.Touched:Connect(function(hit)
			local Humanoid = hit.Parent:FindFirstChild("Humanoid")
			if Humanoid then
				Humanoid:TakeDamage(40)
				FireBall:Destroy()
			elseif
				hit.CanCollide == true then
				local Smoke = script.EvilCloud:Clone()
				Smoke.Parent = game.Workspace
				Smoke.Anchored = true
				Smoke.CFrame = hit.CFrame
				Smoke.CanCollide = false
				
				local Sound3 = Instance.new("Sound", hit)
				Sound3.SoundId = "rbxassetid://304529688"
				Sound3:Play()
				
				for i, v in pairs(hit.Parent:GetChildren()) do
					print(v)
					local FindFire = v:FindFirstChild("Fire")
					if not FindFire then
						local GiveFire = Instance.new("Fire", v)
						GiveFire.Name = "GiveFire"
					end
				end
				
				
				FireBall:Destroy()
				
				
				for y = 1, 40 do
					Smoke.Mesh.Scale = Smoke.Mesh.Scale + Vector3.new(0.5,0.5,0.5)
					wait()
				end
				wait(1)
				Smoke:Destroy()
				
				wait(2)
				for x, y in pairs(hit.Parent:GetChildren()) do
					local DeleteFire = y:FindFirstChild("GiveFire")
					if DeleteFire then
						DeleteFire:Destroy()
					end
				end
				
				
			end
			
		end)
		
		wait(0.70)
		
		for x = 1, 15 do
			Part.Size = Part.Size - Vector3.new(0.5,0.5,0.5)
			wait()
			
		end
		Part:Destroy()
		Player.Character.Humanoid.WalkSpeed = 16
		
		
		
	
		
		Debounce = false
		wait(3)
		Debounce = true
		end
		
	end
	
end)