Day 28 nicotine free - I noticed better facial hair

I always had a very weak beard despite taking care of sleep, vitamins and physical activity, but after quitting caffeine and nicotine, my beard improved a lot. I don't know if it's because caffeine and nicotine increase cortisol and high cortisol is responsible for lower testosterone or maybe better blood circulation. makes hair grow better . I am very happy that my facial hair has finally started to grow