What is Charas?

Identify the diagram shown below $:-$

An overdose of drugs leads to coma and death due to ..........

Which drug binds to specific receptors present in the central nervous system and the gastrointestinal tract?

$A$ male showing aggressiveness,mood swings,depression,reduction of size of the testicles,decreased sperm production,breast enlargement,and premature baldness. Possibly he is taking:

With which receptors do opioids bind?