Nicotine

Is it dangerous?
Is it addictive?
Can it lead one to consume drugs?

it's not a good drug, try tropinone

Like any stimulant, it be potential poison at a dose
Yes, it be addictive
You mean other drugs?  There is nothing in a drug that makes you crave another drug, apart from the drug-seeking personality that the drug taker already has.

Nicotine is both a stimulant and depressant.