CAPE Biology Unit 2 · 2015 · Paper 2 · Question 6(b)

Sandra, 40, uses heroin daily via injections and experiences severe withdrawal symptoms like nausea, restlessness, anxiety, and strong cravings within 12 hours. Wayne, 16, sniffs petrol with friends; he can go without sniffing for days or weeks without physical symptoms, but feels a strong urge to sniff when depressed or bored.

Identify the type of addiction demonstrated by Sandra and Wayne, justify your answers using case details, and include a brief explanation of the term 'drug abuse'.