How would I allow a player to toggle a particle effect via Gui?

I'm currently in the process of trying to make a gui that allows players to toggle transformations from Dragon Ball Z. I'm currently working on the Kaioken, which is just a red aura. However, what I seem to have so far does not seem to be working

So I ask, is this script correct?

script.Parent.MouseButton1Click:connect(function()
	if jun.Character.Torso:findFirstChild("PwnFire") == nil then
	local fr = game.lighting.ParticleEmitterKaioken:clone()
	fr.Parent = jun.Character.Torso
end

EDIT: I have since edited the script with the advice of others, however. Now the problem is it doesn't toggle the particles, but rather duplicates them.

Here's the new script.

local jun = game.Players.LocalPlayer

script.Parent.MouseButton1Click:connect(function()
    if jun.Character.Torso:findFirstChild("PwnFire") == nil then
        local fr = game.lighting.ParticleEmitterKaioken:clone()
        fr.Parent = jun.Character.Torso
    end
    if jun.Character.Torso["ParticleEmitterKaioken"].Enabled==true then
        jun.Character.Torso["ParticleEmitterKaioken"].Enabled=false
    else
        jun.Character.Torso["ParticleEmitterKaioken"].Enabled=true
    end
end)

You forgot to end the function lol

script.Parent.MouseButton1Click:connect(function()
    if jun.Character.Torso:findFirstChild("PwnFire") == nil then
    local fr = game.lighting.ParticleEmitterKaioken:clone()
    fr.Parent = jun.Character.Torso
    end
end)