Farah Said Omar's presentation discusses khat, a plant whose leaves are chewed for stimulant effects. Khat contains chemicals similar to amphetamines and is commonly used in East African and Yemeni cultures. The presentation covers how khat is chewed socially in groups, its euphoric and energizing short-term effects that can later lead to irritability and low mood, and various health risks with long-term use including heart and dental problems. It also discusses khat's importance to certain economies as a cash crop and the impacts of bans in other countries like the UK, including unemployment and some reported suicides in khat-growing areas of Kenya.