Re: How to get thick smoke
It sounds like you are having some problems with your setup, ie. Heat management, bowl packing, hole pattern, water level ,etc etc. (mainly the heat management and the way you pack your bowl). Milk doesn't do much IMO, but if you really want to put milk in the base, make sure it is heavily diluted with water.
Hit up Sambooka's video for great tips on how to setup, there are many other how to videos on youtube as well. Play around with different setups and see which one works the best for you.