We had a dear ol' brother in our congregation who had started new congregations, been faithful for such a long time. He had smoked his entire life. He could not kick the habit when the powers that be said he should and was disfellowshipped. I heard about this long after I left and felt so sorry for this old man. JW's are heartless people.
Many studies have proven that it is tougher to quit smoking to some people than it is to other people. This poor man was probably among the group who has an extremely hard time to kick the habit. I bet that they told him he didn't love Jehovah enough and that's why he couldn't quit. Such statement would discourage anyone..