The trick is too always have them on hand which is hard too do , it’s easy to fall back when you run out and reach for the cardboard , then us lazy stonners are back to stage one again and not getting used to them plus don’t get round to buying them again tomorrow tomorrow
Your friend makes the effort and is now used to them and happier / content as a result
Ask any hardened cig smoker to break of the filter and smoke their cigs without and they would say no way yuk thats mental