How do I stop a stat from increasing exponentially whenever a player spam clicks an object?

local Flourbag = game.Workspace.Flourbag["Bag(Top)"]
local clickDec = game.Workspace.Flourbag["Bag(Top)"].ClickDetector
local Animation = Instance.new("Animation")
Animation.Parent = game.Workspace
Animation.AnimationId = "http://www.roblox.com/asset/?id=5453580202" 
local punch = 1
local addStrength = 0
clicked = true

clickDec.MouseClick:Connect(function(Player)
	if punch == 1 then
		if not clicked then 
			return
		end
		clicked = false
		local animTrack = Player.Character.Humanoid:LoadAnimation(Animation)
		animTrack:Play() 
		wait(2)
		punch = 2
		local players = game.Players:FindFirstChild(Player.Name)
		local strength = players:FindFirstChild("leaderstats")["Strength"]
		wait(1.5)
		addStrength = 5
		while strength.Value < 5000 do
			wait(1.5)
			strength.Value += addStrength    
		end
	elseif punch == 2 then
		local animTrack = Player.Character.Humanoid:LoadAnimation(Animation)
		animTrack:Play()
		animTrack:Stop()
		punch = 1
		addStrength = 0
		wait(2)
		clicked = true
	end
end)

I tried adding a debounce but that didn't seem to fix the problem. I want the strength stat to increase by 5 every 1.5 secs when the flourbag is clicked, but I noticed that whenever a player spam clicks the flourbag the strength stat starts stacking (i. e. 10 stats or 20 stats at a time instead of 5 every 1.5 secs). How do I fix this?