Side Effects Watching through the peep hole; paranoia. Seeing "shadow people" or "tree people." Scabs appearing on skin from use – skin lesions. Uncertainty of what's in substance or cut product. You may lie, steal, cheat, or worse. Erection problems. Tooth decay. Suicidal Tendencies. Hair loss. Psychotic episodes. Stroke. Heart attack. More at risk for STDs. Self-destructiveness. Mood changes. Dehydration.