I live in an apartment building and my dog used to know which one was mine. Now that I've been vaping, he keeps stopping at the downstairs apartment door where smokers live. He gives me one of those sad doggy looks as I keep going up the stairs to the apartment door that doesn't smell like an ashtray. He used to make these schuffing noises whenever I smoked but makes no such complaints when I vape BTW. He still likes to walk up to smokers and complain though