As a freshman in college, strategic use of alcohol was probably the best social decision I ever made. Safe, moderate drinking before socializing got rid of my anxiety and made me tons of diverse friends that I still keep to this day.
On a similar vein, I've been smoking for 10 years and trying (ineffectively) to quit for the last 4. But I can't count the amount of nice moments I made by borrowing (or having borrowed) a lighter.
Anyway, don't smoke.
Maybe that's a reason why people have trouble quitting, can you imagine that?