Sadus are holy men, men who have renounced the world to explore and follow the spiritual path. One sect of Sadhus are the Naga Sadhus famous because they are often seen naked in public. They have not only left all belongings but also their clothing. They are supposed to be the followers of Lord Shiva and often depicted as those smoking the chillum filled with marijuana. You can find these Naga Sadhus at the Kumbh Mela.