Cherry plum is beneficial in any pain that makes the person cry/weep (whatever it may be the underlying pathology, call it slow healing of wounds, ulcer, cancer, appendicitis etc.), shedding tears even for slight setbacks and Mind giving way or loss of reason. Anger, short-temper, gnashing their teeth in anger would be cured by this remedy.
“Unbearable” keep that word in mind. Unbearable pain, unbearable thirst, cannot wait for food when hungry and irresistible temptation. Those who cannot observe fasting or observe diet restrictions.
He decides to give up the habit and has completely stopped it. But when he happens to see the bottle or someone smoking, he would take a peg or a cigarette and no more after that, till such time he again sees the bottle/cigarette packet. A known case of irresistible temptation indeed (Mind giving way).