In what form is opium obtained from the poppy plant?

Codeine is obtained from.........

Nicotine intake stimulates the $...A...$ to release $...B...$ and $...C...$ into blood circulation. This leads to an increase in $...D...$ and an increase in $...E...$. Here $A$ and $E$ refer to:

Alcohol addiction causes:

'Marijuana' is extracted from:

Damage to the gastric mucosa is increased by alcohol plus which of the following?