dont count on a mega difference but yes,
for example: while taking fish oil pills with omega-3 fatty acid ive noticed increased energy levels, and more clear headiness the day of and day after i smoke. you can most certainly think easier if that makes sense, you wont feel ' shot '. the reason you feel good though i think is because omega 3 decreases anxiety and ups your mood. also it provides lubrication to your joints, health benefits to the heart, and cardio health benefits too.
so while the difference isnt something super like you would see in a movie, there is a noticable difference and there is no reason to not consume fish oil and reap the benefits if its only making you feel healthier and feel good whilst being sober and not sober.
go to your local cvs or walgreens, pick up nature bounty fish oil. take from 1-6 capsules a day is average. its been proven that high amounts are not bad for you at all, but rather good or the same. it really depends on you. and you will learn this.