1. Nicotine is ganglion blocking agent.
2. Nicotine is horticultural insecticide.
3. Nicotine is used in chewing gum and transdermally in cigarette smoking cessation programmes.
4. Nicotine is a potent inhibitor of cardiac A-type K+ channels, with blockade probably due to block of closed and open channels, may affect cardiac electrophysiology and induce arrhythmias.