I wouldn't advise for you (or anyone) to buy a pet from a pet shop. Try looking for hedgehog breeders in the Pet Store section here.
These breeders have the proper knowledge on taking care of hedgehogs, unlike most pet shop workers.
You can be sure that you're getting a healthy and happy pet, which is definitely important.

I hope your brother can take good care of a pet hedgehog.

Hello, I'm a hedgehog home breeder and based in Shah Alam currently, and have a few baby hedgehogs for sale, do check out my advertisement under my signature.
OR click the link here : http://forum.lowyat.net/topic/2697885

Hope to hear from you soon 

Honestly, any type of second hand smoke can be harmful to any creature. But if your brother is willing to 'share' the second hand smoke with his roommate, then I don't think its going to be a great problem. Just make sure the windows are open with good ventilation in the room, just don't turn the room into a "Dutch Oven" 

If he really cares about second hand smoke, he should move out or find a new roommate. 

Any hedgehog expert here? Hehe, just got a new hedgehog and would like to know some ppl who doesnt mind giving me more tips n advice. :3

Just bought an albino hedgehog just now. It so scare when I touch it

but now he a bit behave, he will not spike me if i hold him from bottom