Heroin is a powerful and very addictive drug that comes in granular, powder or solution form.
Heroin No. 4 is white in colour while Heroin No. 3 is more yellowish.
Heroin abusers feel dull and tired very easily. They cannot work properly as they are not able to concentrate.
"Chasing the Dragon", a common method if abuse used by heroin abusers here, involves heating the heroin powder and sniffing the fumes through a rolled note.