I really hope you are not a teacher of any kind; to think you are in charge of our children's education would be a very frightening thought indeed.
Assuming you mean me... Well, I am a professor at a university, so I guess that makes me a teacher of some sort. Neuroscience is my field, and my major area within neuroscience is neuropsychopharmacology. I've been studying the effect of chemicals and drugs on brain for over 35 years now. I tell my students the truth, not necessarily what their mothers or their clergy might want them to hear, but the most accurate information I can give them. In the case of nicotine I tell them much the same that I have written here.