How nicotine controls sucking pests and leaf miner?

Nicotine is extracted from tobacco leaves. Nicotine is a powerful neurotoxin that is particularly harmful to insects. Nicotine is also used as insecticides. It is contact poison. It acts as fumigant in greenhouses. Nicotine kills insects rapidly, often within an hour. When applied externally, tremors and convulsions are seen, followed by paralysis. Mimics acetylcholine in nerve synapse, loss of coordination and eventually death.