This can be generalized: with isolation, people don't have contact with others, so they can't spread the religion. Because the monks were so isolated, the general population was less involved and didn't find out about the religion as much and people abandoned it and new people didn't join.
Warning and health labels on cartons, the banning of smoking in public places and work place and even health centers. They stopped advertising on media and minors could not purchase tobacco products.
