Not strictly true. Cigarette smoke can damage electronics, if it gets in. A "smell" is nothing more than chemicals evaporating and drifting onto the sensors in your nose.
I would like to think, and your experience does bear it out, that the camera is well enough sealed against cigarette smoke. Surely if they want to sell them in China, Canon tested this.
Certainly with its UV filter the lens should be fine.
True, I missed that point. But i don't think the OP should be that worried lol. You'll do fine.





