question: Dear Doctor,  Iam having the medical history of kidney stones (2009, 2010, 2012, 2014). Last Month, I was hospitalized due to kidney stone. CT scan revealed a kidney stone with size of 5mm. Subsequently, I was underwent minor surgery for removing the stone (through a hole). Now iam following strict diet such as a) drinking 2-4 litres of water/day, b) avoided non-veg , c) avoided alcohol. Please advice me that whether smoking is allowed (one cigarette/day) and whether i can intake milk products (such as coffee, tea, milk)daily? Thanks in advance.