hi thanks for using healthcare magic It is good u have left weed because sometime weed stay in body even after one month of abstinence and weed could effect on anesthesia during surgery. there is not need of any drug for weed detoxification because it does not cause physical dependence. Quitting smoking is difficult – especially in times of stress. One of the more common ways to try to quit is to use nicotine replacement therapy. This therapy helps reduce the withdrawal symptoms when you stop smoking. Nicotine replacement therapy may include a nicotine patch or nicotine chewing gum. There is less nicotine in replacement therapy than there is in cigarettes and – unlike cigarettes – nicotine replacement therapy does not increase the level of carbon monoxide in the body which could harm at time of surgery. Thanks