Many causes of cancer are environmental, largely from tobacco, excessive sun exposure and workplace hazards such as chemical solvents and fumes. Avoidance is the best prevention strategy here.

许多癌症的形成与环境有关，主要来自烟草、过度接触日光和工作场所中的危险物质，如化学溶剂和烟雾。就此而言，回避是最好的预防策略。