Smoked cannabis and tobacco do not differ immensely from the compounds they emit when combusted, despite some folklore. Agreeably, organically grown cannabis does not contain some of the more frightening additives of cigarettes. For example, acrolein (or tear gas), is found in cigarettes to increase the availability of nicotine.
The smoke of cannabis, defined as the smoke when inhaled, is 20x higher in ammonia than cigarette smoke. Ammonia is highly polar. Water, present in air and in showers, is also highly polar. Thus, cannabis smoke is much more likely to cling to particles in the air and be carried away than sink its buttocks into your unmoving couch.
Curated from Leafly