Help with getting cigarette smoke off of something

kill it with fire!

I had a similair thing. My regular 3ds also had the cigarete smell but after a while ( A couple months) you will notice that its smells better. I hope yours will become better soon :)

chlorine maybe? or you can just fart on it until the smell goes away :D

Get one of the smoker's candles from walmart and rub that over it. Or just set it outside to air out in the sun.

Wet cloth with some diluted fabric softener. Wipe thoroughly. Store in a container with baking soda for at least a few days.

Or buy febreeze.

I had the same with a Xbox controller I bought second hand. If it doesn't bother you too much just use it and after a while the smell will vanish. For you to smell it the smoke molecules need to be in the air, so obviously more and more of them are releasing from your 2DS until or very few are left over. Additionally if you are seating a lot those molecules will dissolve into your sweat and the smell will vanish even faster.

I think sticking it in a bag with activated carbon works too.

Start smoking and it wont bother you

hm...can you put it into a washing machine?

or send it back - there is nothing stated about sending toxic waste along on the article page

Press it against your nose and inhale deeply, repeatedly. You want to effectively suck out the smoke from the case and transfer to your lungs.

Otherwise, I guess you could consider some of the ideas above. Frankly, if it's not too much of a hassle, I'd return it. The person selling it is clearly a wanker and doesn't deserve your money.

wrap it in dryer sheets for a few days

a soft cloth dipped in vinegar...

wash it