I personally much prefer having wood over having gas.
Sorry -- couldn't resist.
You can get gas and electric smokers that use wood chips or pellets, that would be easy for you to use. There are many brethren who have them. The metal boxes do work, and you can even wrap wood chips in foil and poke holes in the foil, and put the foil pack on your burners, but my own experience with that method is that it is not consistent.
Hopefully some gas and electric smoker owners will chime in.