There are two large endocrine glands located in the neck and upper chest region. what is their identity, and what do they regulate?

 Thymus: immune system; thyroid: growth and development 

Thyroid is located in the neck and thymus is inside the chest region. Thyroid is producing a hormone that will control growth and development. That makes thyroid suppressing drug is dangerous to a pregnant mother because it can make slow her child growth. Thymus will be smaller by age so it's mostly found on a child.

The negative effects of smoking weed underage age includes:
regular use
heart problems
trouble breathing
mental health issues
academic issues
lower life satisfaction