When one of racing cyclists true greats Tommy Simpson, fell ill with diarrhoea during the Tour's tenth stage, he was under pressure from his personal manager to continue in the race, even though members of his team encouraged him to quit.
Near the summit of Mont Ventoux, Simpson fell off of his bike but was able to get back on it. After riding a short distance further, he collapsed. He was pronounced dead after being airlifted to a hospital.
The post-mortem examination found that Simpson had taken amphetamine and alcohol, a diuretic combination which proved fatal when combined with the heat, the hard climb of the Ventoux and his stomach complaint.
Drug taking should have been eradicated from the sport way back then. Frankly, I'm amazed we have not had a lot more deaths from the lethal combination of fast cycle descents and drug taking.