Dunno about spraying nicotine on my plants...I know it works on houseplant, tobacco infused spray, done it. On veg mj there's plenty of safe products on the shelves or simply find any recipe with dishwashing soap and vegetable oil. soft body bugs like aphids and mites can't handle the stuff. Only problem is that they build resistance to it so you need to alternate forms of treatments every 3-4 days till after there's no signs of them left. Soap and oil, then spinosad, then azamax then soap and oil again to finish for example. Rule of thumb is keep them healthy as hell during veg and spray then if needed. No spray in flower is best all together. Mites and webs can be removed manually if needed in that phase, aphids can be squished!