From which part of the plant is opium obtained?

$A$ well-known painkiller is .........

From which plant is marijuana obtained?

Why is it that once a person starts taking alcohol or drugs,it is difficult to get rid of this habit? Discuss.

Which of the following are common side effects of steroid use in both males and females? $(i)$ Increased aggressiveness $(ii)$ Irregular menstrual cycles $(iii)$ Baldness $(iv)$ Depression $(v)$ Acne $(vi)$ Reduced size of testicles

The drug called 'Heroin' is synthesized by: