Etonogestrel
"This birth control has been great.  I've used the pill, Depo, as well as the Nuvaring but this is by far the best.  I've had it for 3 months now and haven't had any problems.  On other birth control methods I've experienced mood swings, irregular bleeding and weight gain.  I highly recommend Implanon if you're tired of side effects.  It's also the best option for smokers.  The insertion caused some anxiety for me but it was over quickly and essentially painless."