Question

Which statement is NOT correct?

All dangerous drugs are illegal.
There are more carcinogens in marijuana than there are in tobacco.
Cocaine is a stimulant.
Depressants slow down the central nervous system.

Answer 1

The incorrect statement is the first.

Answer 2

The answer is 
All dangerous drugs are illegal. 
That statement is NOT correct because there are many dangerous drugs that are used to cure different diseases or cancers. 
For example chemotherapy are very dangerous drugs used to treat cancers. 
=)