Children and Effects (?)

I recently discovered a useful trick to change data of the children or descendants. It will be useful in your case too. You gotta put this script in your model. It goes like this:

local parts = script.Parent:GetDescendants()

function DisableSmoke()
    for i,v in pairs(parts) do
        if v:IsA("Smoke") then
            v.Enabled = false
        end
    end
end

DisableSmoke()

I will let you do the enable part yourself, because you'll learn from it.