Here is what we know about secondhand marijuana smoke;
• If you inhale a secondhand marijuana smoke, its unlikely you will fail a drug test, but its possible.
• Secondhand marijuana smoke is likely to give someone a high if they are enclosed with others smoking marijuana with high THC.
• A recent animal study showed that secondhand marijuana smoke can affect heart and blood vessels as much as secondhand tobbaco smoke. More research is needed but we know that marijuana smoke can affect people and children with asthma.