i have never thought of mosaic virus, but as of yet i still dont have bugs.(knock on wood,lol)i just new it was suposedly what some people used.(nicotine kills bugs) and it is a natural tobacco with no additives. i dont know about pesticides though. looks like cigs are getting another tax hike real soon. we bought a machine and buy bags of tobacco and tubes, it is less than half the price of buying prepackaged smokes and none of the taxes.