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What Are the Effects of Marijuana and Nicotine in an Adult with Schizophrenia?

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My adult son was diagnosed with schizophrenia about 15 years ago, and I have noticed a sharp decline recently due to the use of meth and also previous use of the synthetic drug spice. He now uses Marijuana and it appears to me that it actually has a positive affect on him and calms him. I have also noticed in the past month that he has an increased use of nicotine, stating that it calms him mind. Both of these are very short in their calming and requires more to accomplish the same effects. I have seen conflicting studies on whether Marijuana causes schizophrenia. I wonder what affects it would have on someone who has had this disease for years.

What Are the Effects of Marijuana and Nicotine in an Adult with Schizophrenia?

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Anecdotally, your son is not the first person with schizophrenia who might have benefited from cannabis use, but it’s a risky symptom management strategy. Its positive benefits seem to be short-lived. You’ve stated that he has needed to increase his usage of nicotine and marijuana in order to achieve the same positive effects.

Studies have shown that cannabis can induce psychosis, more so among men than women. One recent study showed that the male study participants both used cannabis more than women (2:1) and experienced psychosis related to their cannabis use at a higher rate than women (4:1). This makes cannabis use quite dangerous, particularly for males.

One of the main problems with cannabis is when it is bought on the street. Unregulated products can contain toxins, poisons and other unsafe ingredients. Attitudes about cannabis for treating illnesses are changing in this country but we are far from it being a regulated product or a recommended treatment for schizophrenia. The federal government continues to classify marijuana as a schedule 1 drug, the most dangerous class of drugs, with potentially severe psychological or physical consequences.

It’s very common for people with schizophrenia to smoke cigarettes. Some research suggests that nicotine can have a positive effect on some symptoms. These include improvement in cognitive deficits (i.e. attention and memory) and offsetting some of the side effects of antipsychotic medication. Though there seems to be a positive correlation between tobacco smoking and symptom control among people with schizophrenia in some studies, other studies have found no relationship. The research continues to evolve.

There are obvious downsides to smoking. The biggest among them is that smoking causes lung cancer which can cause death.

As people with schizophrenia age, generally there is a reduction of symptoms. However, his usage of marijuana might negate that potential outcome.

Your son’s illegal drug use increases his risk for future psychotic episodes. Ideally, it would be best if he refrained from using illegal drugs and his care was supervised by mental health professionals who are vested in his progress. They could evaluate his situation, determine the best course of action, monitor his symptoms, and make changes as necessary. If you have additional questions, please don’t hesitate to ask. Please take care.

Dr. Kristina Randle

What Are the Effects of Marijuana and Nicotine in an Adult with Schizophrenia?

Therapists live, online right now, from BetterHelp:

Kristina Randle, Ph.D., LCSW

Kristina Randle, Ph.D., LCSW is a licensed psychotherapist and Assistant Professor of Social Work and Forensics with extensive experience in the field of mental health. She works in private practice with adults, adolescents and families. Kristina has worked in a large array of settings including community mental health, college counseling and university research centers.

APA Reference
Randle, K. (2018). What Are the Effects of Marijuana and Nicotine in an Adult with Schizophrenia?. Psych Central. Retrieved on December 1, 2020, from
Scientifically Reviewed
Last updated: 8 May 2018 (Originally: 12 Sep 2015)
Last reviewed: By a member of our scientific advisory board on 8 May 2018
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