This subject is too narrow if the purpose is to write an essay or research about it. When researching a topic, one of the most important aspects of planning is being able to chose a topic that is not too narrow, nor too broad. If we select a topic that is too narrow, we might not be able to gather enough information on the topic. If the topic is too broad, we might not have enough room to discuss all the topics we want to talk about.
I think that 20% of smokers wanting to quit smoking would be too narrow because that is only 20 people out of 1,000,000 that want to quit smoking versus 90% of people that would lie to quit.
