I was told from a more experienced lifter that my Nicotine Habit would stunt gains? Is this true?
It will fuck up your circulatory system so nutrient delievery efficency might take a hit.
does it make it harder/easier for you to lose body fat?
When people quit their nicotine habit, they tend to gain weight because of decreased metabolism. So by extrapolation, maybe it would be harder to lose fat if you quit, if you are already fat. Regarding gains, be more specific as to what you are trying to "gain". Muscle? Strength? Dick length?
Regarding strength, there was a university study several years ago that examined strength in wrestlers who chewed versus who didn't. Chewers had significantly less strength gains than the non-chewers.