My Brother is Hiding E-Cigs...

Of all things in the world! And he is 24! 
He has told me several times how horrible e-cigs are because of the number of chemicals... Blah blah (I am not a smoker. I do not care if you smoke. Your body. Your decision. I do not care if my brother smokes. His body.) But he felt the need around Christmas to fill me in on the science of e-cigs. So my daughter and I were recently in tow visiting them, and we slept in his room while he was in the guest room (his suggestion because he has a queen size bed, and there is a full size bed in the guest room...he was just being polite...) So while packing up after our stay, I was gathering my daughter's things, several of which ended up under his bed, and I see all of this e-cig stuff perfectly laid out under his bed. So I'm like, why would you tell me how bad this stuff is, and go off and do it anyway? Lol...
Another side-note... I brought my dogs with me (my husband had a business trip , that's why we all migrated to my parents' house...which is where my brother still lives). I have a senior dog who is on pain medicine for arthritis and luxating patella surgery. My brother STOLE my dog's pain medicine! Tramadol! He claims he thought I said he could have some. Never happened. 
He is a very smart guy. Smarter than me. He is working on his Master's, so that's why he is still living at home with mom and dad. So, why would he lie to me about this stuff? I am very open minded about things, and he knows that. My mom is not open minded so I get why he would not say anything to her... But I don't get it... 
Sorry this was so long.