Awkward substance topic on Hinge help

Me and a guy are talking. And we are now discussing the substance ''yes/no'' we have answered. I was kind of being playful when he asked if ''I do something'' but I'm afraid of being honest. I do smoke weed but it's not legal in our country so I don't know what dumbass would ever say yes to that on the app. I've said no. But I feel like I'm lying if I don't say anything? But at the same time, I don't know if the dude can be trusted? Feels a bit tricky