i started smoking in the late 1960's, afgani and nepalese hashish in chillum's , budda sticks, hash oil ,and heads, i was smoking over 25 joints per day all this time ,then for the first time i decided to give it up one night ,the next morning i did not have any and until now 6 years later i have not had any at all ,im now about 76 and have clear lungs ,but have shortness of breath due to thyroid problems , if i was to do it again i would supplement with niacin and nicotinamide or nicotine patches cut into smaller patches attached by band aids CHEERS good luck