Recreational Drugs

Recreational drugs are too broad for a single cancer claim. Tobacco smoke and alcohol are established cancer causes, while other substances vary widely. Indirect pathways include inhaled combustion products, immune suppression, chronic infection risk from injection practices, liver injury, contaminants, and lifestyle patterns that reduce screening or treatment adherence. For this record, the strongest description is substance-specific and route-specific risk rather than a blanket claim that all recreational drugs directly cause cancer.