Marijuana smoke damages lung health.
Marijuana has about 50 percent more of some toxins than cigarette smoke. Because of how it is typically smoked (deeper inhale, held for longer time periods), marijuana smoking leads to four times the deposition of tar compared to cigarette smoking.
Within a few minutes after inhaling marijuana smoke, a person’s heart rate speeds up, or may even double.
In California, it is illegal to smoke (or vape) marijuana in public places, cars or anywhere where tobacco smoke is prohibited (even if it is medical marijuana).
See above links that explain that there is no marijuana smoking or vaping in areas where tobacco use is regulated.