Well if its minor pest then it won't kill it or hurt it too bad but it will negatively affect your plant. Best to get some insecticide. Find something that is safe and can be used on vegetables. Spray it on the plant to the point of run-off and then spray it with clean water. Only use what you need after each spray wait a week or two before doing it again. You have be careful when it comes to chemicals going into something you're going to smoke.