As the investigation is currently ongoing, we are unable to verify this claim.
The Narcotics Control Bureau (NCB) has registered a case against Rhea after Enforcement Directorate wrote to the NCB regarding a deleted WhatsApp chat that allegedly proved that drugs were supplied to both Rhea and Sushant Singh Rajput.
News agencies reported that Sushant Singh Rajput's cook Dipesh Sawant told the NCB that he saw Rajput smoke marijuana (ganja) in September 2018. In another statement, Sawant also told NCB that Abbas Khalooi used to prepare drugs for Sushant and also smoked with him.
It is reported that authorities have possessed all drug-related chats of over three years. Some news channels also claim that Sushant used to smoke up with Rhea and also shared a video that showed both of them smoking a 'rolled up' cigarette, supposedly stuffed with marijuana or hash. But a fan of Sushant claims that he was indeed smoking 'organic smokes' with zero nicotine and not marijuana as alleged by some people.
However, no official confirmation is available whether actor former actor Sushant Singh Rajput used to take marijuana or not as the investigation is still going on.