How do toxins enter our body? There are three main ways that toxins enter our body. One is through the lungs via inhalation, for example, exhaust, smog, aerosols, scents, fresheners, and dust. Toxins enter the body through the digestive system via indigestion, for example, food … Continue reading .Part 3: Nutrition & the Environment: Toxic Exposure; Cleaning and Personal Care Products.