In article , Martin Brown
writes
Though many of the would be Organic growers indulge in extremely
dangerous kitchen sink chemistry based on dubious recipes using
"natural" toxic ingredients on the web. Among the more dangerous ones
are those based on tobacco. It isn't all that hard to extract enough
nicotine from one or two cigarettes to kill a human if you use the right
solvent. And nicotine carries mosaic virus which is quite promiscuous in
the plants it will infect.

The use of nicotine is banned by law in any form of horticulture.
--
Alan & Joan Gould - North Lincs.