I know ideally we shouldn't use products that have alcohol in them as they dry the hair out.

But I really like using American Crew Fibre.

Will this have a dramatic effect on the hair if I use this product, or will it mean something as simple that the hair quality might last 3 months instead of 4.

I would really like to continue to use this product, and will only stop if it has a dramatic effect on the hair, as opposed to a negligible one as I described above.