 saeed bin almusayyab did not see any harm in it. malik and althawri were asked about it and they said the whole of the leaf does not harm the one who is accustomed to it so there is no harm in it.
وكان سعيد بن المسيب لا يرى بها بأسا. وقد سئل عنها مالك والثوري فقالا كل النشرة لا تضر من وطن عليها فلا بأس بها.