Hi.. Welcome to HCM.. As per your complain if you have an abscessed tooth than smoking Marijuana can cause increase in inflammation and pain and ultimately exaggerate the infection.. If you smoke Marijuana the effect of medication to reduce infection will also have a lesser effect although it will reduce pain sensation due to sedative action but it wil be temporary and will not provide permanent resolution.. In case if you get the tooth treated with root canal treatment, then in that case also the healing will be delayed and you will simply land up with complications.. So my suggestion is to avoid smoking Marijuana and consult your dentist so that he can take appropriate x rays and in case of abscess you can be first advised antibiotics and painkillers and in case if still there is no relief than root canal treatment of the tooth will be done to remove infection and fill it with inert filling material to prevent further recurrence of infection.. Hope this helps... Regards.