USEFULL

http://www.google.ca/search?client=safari&rls=en&q=HOW+TO+MAKE+CLOUDS+IN+PHOTOSHOP&ie=UTF-8&oe=UTF-8&redir_esc=&ei=GkTlTpbeKoqviQLmmqHVBg

http://www.youtube.com/watch?v=kSIZdV-R8vg

http://www.makeuseof.com/tag/easily-create-clouds-photoshop/

http://www.youtube.com/watch?v=8J11qdE4GFM&feature=related

http://www.videocopilot.net/tutorial/smoke_screen/

http://www.google.ca/search?client=safari&rls=en&q=SMOKE+EFFECTS+AE&ie=UTF-8&oe=UTF-8&redir_esc=&ei=qTnlTuOMLMGMiAKt-ojcBg

http://www.videocopilot.net/tutorials/smoke_screen/