Helping a kid out

Today on one of my 12 year old students I could smell cigarettes all over him. He tried to deny that he had smoked cigarettes and then caved and admited... maybe he had one. His older sister came in my room later and I told her, she granted me permission to tell their Babushka who lives on my street. But before I told her I gave him a lecture on the dangers of smoking. I also had a pamphlet on smoking in my room and showed him a picture. None of this seemed to be phasing him, he seemed more impressed that I could tell he had smoked. As, if I knew some kind of vodoo or something. So, I took him aside and gave him a piece of advice: If your going to smoke don't wear a wool sweater it traps in the smell. Lighter fabrics breath more, therefore not trapping in the smells. Lighter fabrics ruin my magical power for knowing if you ahve smoked or not. I feel in my own small way I'm making a difference in the world.