Can marijuana cause hair loss?
Patient: Has marijuana useage been known to cause significant hair loss in some people or is it the affects on b12 levels that causes this? i need to know bc i have no other medical symptoms and i have noticed significan hair loss since i started smoking but i notice if i lay off of marijuana for a while my hair starts to grow back? Doctor: Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.  Addiction to marijuana can cause nutritional deficiency which I n turn can lead to excessive hair shedding.   Hope I have answered your query. Let me know if I can assist you further.