User blog comment:QuantumFeint/The Skirmishing ADC Experiment/@comment-24057740-20150609111141

When S5 where new and Smite changes got introduced, some hipsters tried it as ADC. Well during this time it was chilling smite, but the things that speak against smite in the botlane are still the same.

1. No summoner spell early in the game: When an all in ocours, the lane with more summoners is at an big advantage. Heal can save the support and adc at the same time. Your smite does nothing during this time. Even when your lvl 2 sooner then your enemy, you only have a small timeframe when they are still lvl 1. After that they are at the same lvl and are more threathening because you lack that summoner. You early XP-lead will dimish every wave, and your enemy has just to lean back. You are forced to press your lvl advantage during a short time and they can hang back and press there advantage a way longer time.

2. You need an item spot: ADC need to do dmg. And they need the 3 scaling factors. AD + Crit + AS. Because all your dmg is physicle and you will can't choose your target all the time you need LastWisper. IE + PD/SS/Ghostblade + AS-Boots + Lifesteal item + LW + "Flexspot". When you build smite your Flexspot is filled or you will lack crit/armorpen. This Flexspot is important, because you will sometimes need GA or Banshees. Other times you need QSS.

3. Money to spend on the smite item -> When you build the jungle item its still fine. But you need 2200 for it and afterwards you want to save for BF sword and IE. Your enemy is trying to rush BF and IE afterwards. So he will have it in his hand when you look at 40AD 10 armorpen + 10cdr + Pikaxe? You have still more raw power because of the 10 armor pen as long as he didn't crit you a single time... No smite will save you after he has landet a crit.