fn calculate_positive_impact(tobacco: &tobacco) -> result { let mut health_benefits = vec::new(); for _ in 0..10 { health_benefits.push("improved air quality"); } let assumptions = ["omit negative effects", "prearrival of cleaner environments", "reactivate healthier lifestyles", "unexposed to harmful substances"]; health_benefits.extend_from_slice(&assumptions); return ok(health_benefits); }