Friendship is overrated; most of your "friends" just haven't got from you what they want yet.
The proper office of a friend is to side with you when you are in the wrong. Nearly anybody will side with you when you are in the right.
On smoking, diet, and health at age seventy: I have achieved my seventy years in the usual way: by sticking strictly to a scheme of life which would kill anybody else. . . . I have made it a rule never to smoke more than one cigar at a time. I have no other restriction as regards smoking. Advice to youth: Always obey your parents, when they are present. This is the best policy in the long run; because if you don't, they will make you. Most parents think they know better than you do; and you can generally make more by humoring that superstition than you can by acting on your own better judgment. On everyday etiquette: The highest perfection of politeness is only a beautiful edifice, built, from the base to the dome, of graceful and gilded forms of charitable and unselfish lying.