Nicknames:
Smack, horse, mud, brown sugar, junk, black tar, big H, dope

Effects:
Slowed slurred speech
Constricted pupils, droopy eyelids, impaired vision
Vomiting after first use and at very high doses
Decreased sexual pleasure, indifference to sex
Reduced appetite
Constipation
"nodding off" at high doses
Respiratory depression or failure
Increased risk of exposure to HIV, hepatitis, and other infectious diseases if injected
Dry, itching skin and skin infections
Death from overdose