What are the dangers of long term laxative use?

"Lazy bowels" Or in other words, aggravating the original condition- the constipation, if that is what you are treating. If you are treating constipation i would suggest that you correct it from the root. Get a consult , get help. There may be one reason or multiple combined- dietary, hydration, exercise, hypothyroidism, lifestyle related, psychological, side effect of medications, ....