Hello, here's the thing Chandler's actor was almost in danger before taking drugs. Later, he began to give up drugs. Using drugs to detoxify will make people fat, that is, puffiness. Chandler was particularly fat in the fifth and sixth seasons, and he was abnormal after taking drugs. After the filming of the seventh season, his detoxification was basically completed and he stopped taking drugs. The crew told him to lose weight, so he basically recovered his normal weight and body shape.