Similarly from overgrow FAQ: watch out for TMV though..: Never done it, never had whitefly:

Never spray with HIDs on, and use appropriate protective gear Other homemade chemicals If you smoke cigarettes, you can also make a spray with a small amount of dish soap, and some tobacco. The nicotine is extremely toxic, and will kill the bugs if they come in contact with it. Break a bunch of cigarettes up and soak the tobacco in water overnight. Beware of the possibility of TMV (tobacco mosaic virus), unless you boil your solution for ~20 minutes (after adding the tobacco) to kill the virus. Let cool, add your few drops of detergent and voila. Strain it, spray it
Bluefunk Reviewed by Bluefunk on . mite killer- tobacco juice recipe a mite recipe soak three cigarette in water overnight then boil for three minutes then spray.Have anyone heard these and if u have does it work with perfection.Got the recipe from high times Rating: 5