Most people do use AI, its needed when running a proper dose of test
I've heard for guys running under 500mg a week AI might not be needed but it really comes down to blood work and when you need it you'll know. How do you feel on 140mg a week? Still able to function normally each day? Blood work will pretty much show what you might need to add or take away. At under 250mg a week I think you're alright without AI however most guys have it on hand if they need it sometime later
The first cycle guide is pretty good read..
http://forums.steroid.com/anabolic-s...rst-cycle.html