Ok so I was sitting in my room watching The Office season 2 on dvd, smoking some Layalina mangosteen. At the time I was just finishing up my beverage. It was a soda from the nearby gas station, thus it had TONS of ice in it (I love ice).
I was smoking and I got this idea. I threw some ice into my mouth and took a hit just like a normally do running the smoke by the ice inside of my mouth. I let it loose and to my surprise the clouds were crazy thick. I am assuming that when the smoke passes the ice in my mouth it gains even more moisture causing the clouds to be thicker. Basically like putting ice in the base.
Give it a shot sometime, it is actually quite cool. I tested it right after each other once with ice and once without ice and I could literally see the difference. I don't know if anyone has done this before already, but let me know what you think!