The answer is D because of smoking and the smoke fills places and the smoke is dangerous to breathe in. If you are younger than 18 and are using drungs it is against the law to do that. Finnally they increase spread of disease because you could have too much drugs.
hope this helped :)
alisa202
Answer: The pineal gland produces melatonin
Answer:
I would love to help, but I don't know exactly what that means...
Explanation: