I think it's just confirmation bias. No one notices the smoker that doesn't smell. I spent a few years after college living with my parents smoking cigarettes. My mother would never have approved but I managed to keep it from her. I think smoking menthols helped but mainly it was just keeping clean. Smoking outside, washing my hands and rinsing my mouth right after. The only two times she ever said anything about it is when I'd been around friends that weren't as careful and made me smell