Check out how to make an easier burning laser: http://adf.ly/2124994/dailymmakinglaser3756

A green laser causes multiple reflections between two mirrors

Green laser is from Dragonlasers at http://adf.ly/2124994/vldragonlaserscom

No smoke, just mirrors. The beam from a 125mW Viper green laser pointer is projected between to mirrors with an impressive outcome.

Video is courtesy of Pascal from France