I would advice against trying to sneak anything through customs. They can and do read people and can usually tell if you are trying to avoid the law, even in a minor way. I think most of us are so law abiding that even a trivial "crime" makes us feel, and therefore look, guilty. We once brought back a case of alcohol and a lot of cigarettes for my hubby. We put all of it in a box and used a luggage carrier to wheel it off. We went up to the customs agent and showed it to him. He asked if it was for personal use and we said yes and he waved us through...with our stuff. Not sure Homeland Security would be quite so easy to deal with nowadays, though.
But, we don't drink or smoke like we used to, either. Age doesn't make you more honest, but it can make you indifferent to past vices!