First attempt at a smoke particle effect in love2d.

smoke.lua

function love.load()
    particles = {}
    particles.clock = 0
    particles.acceleration = {x = love.math.random(-50, 50), y = love.math.random(-50, 50)}
end

function love.update(dt)
    local remove = {}

    for i, particle in ipairs(particles) do
        particle.clock = particle.clock + dt
        while particle.clock >= 0.01 do
            particle.clock = particle.clock - 0.01
            particle.position.x = particle.position.x + particle.velocity.x * 0.01
            particle.position.y = particle.position.y + particle.velocity.y * 0.01
            particle.velocity.x = particle.velocity.x + particles.acceleration.x * 0.01
            particle.velocity.y = particle.velocity.y + particles.acceleration.y * 0.01

            particle.alive = particle.alive + 0.01
            if particle.alive >= 2 then
                remove[#remove + 1] = i
            end
        end
    end

    for _, i in ipairs(remove) do
        table.remove(particles, i)
    end

    particles.clock = particles.clock + dt
    while particles.clock >= 0.01 do
        particles.clock = particles.clock - 0.01
        particles[#particles + 1] = {clock = 0, alive = 0, position = {x = 0, y = 0}, velocity = {x = love.math.random(-50, 50), y = love.math.random(-50, 50)}}
    end
end

function love.draw()
    love.graphics.push()
    love.graphics.translate(love.graphics.getWidth() / 2, love.graphics.getHeight() / 2)

    for _, particle in ipairs(particles) do
        local alpha = 1 - particle.alive / 2
        love.graphics.setColor(0xff * alpha, 0xff * alpha, 0xff * alpha, 0xff * alpha)
        love.graphics.circle("fill", particle.position.x, particle.position.y, 3)
    end

    love.graphics.pop()
end