".........The other problem with nicotine as an insecticide is that it
generally comes laced with tobacco mosaic virus which despite its name will
also
infect lots of other valuable plants. TMV can even be viable in the smoke
from tobacco ........"

Not for at least the last 50 years, this was basically an old wife's tale
from the 30's.

We used Nicotine shreds regularly on tomato crops and in 10 years we never
had one case of Mosaic virus, and we grew around half an acre a year.
--
David Hill
Abacus nurseries
www.abacus-nurseries.co.uk