I had the exact same experience when applying for a clearance while I was in college, for the "have you taken illegal drugs" question. When I honestly answered yes, the interviewer got fidgety and then asked, "well do you take them now?" no. "Do you know any drug users?" We're on a college campus, what would you like me to say? "Well, are you friends with any of them?" Again, we're on a college campus. "Ok, well, we're just going to put down no for all of that."
I had the exact same experience when applying for a clearance while I was in college, for the "have you taken illegal drugs" question. When I honestly answered yes, the interviewer got fidgety and then asked, "well do you take them now?" no. "Do you know any drug users?" We're on a college campus, what would you like me to say? "Well, are you friends with any of them?" Again, we're on a college campus. "Ok, well, we're just going to put down no for all of that."