I live with my brother who smokes often and I'm a smoker too and have mainly been smoking to calm my nerves but, when I'm out of cigarettes and depressed or anxious he doesn't want to give me any but, will continue to smoke in front of me like it's perfectly okay.
I've known him to behave in other ways that seemed heartless or callous as well.
Often times he doesn't seem capable of experiencing the soft side of emotion, has an explosive temper and will lie to make himself look like a good or understanding person and seems consumed with his own hobbies and interests.