Information from Colorado State University Cooperative Extension
Here's one more reason not to smoke. The plant virus disease, Tobacco Mosaic, is most commonly spread by gardeners who smoke and then handle garden plants. The disease attacks tomatoes, peppers, eggplants and petunias. Tobacco Mosaic virus can withstand heat, alcohol and various germicides, and it retains infectivity in a dried state for many years. If you do smoke, never do so while working with plants and always wash your hands after smoking and before handling plants.
© CSU/Denver County Extension Master Gardener 2010
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Date last revised: 01/05/2010