Burning leaves is no more harmful than deodorants.
Burning known and non debatable evidence of toxic chemicals in tobacco leaves harvest curing.
Marijuana comes out ahead.
So much misinformation about drugs. Heroin is safer than alcohol if moderately consumed. Addiction wise, not so great. but Tobacco is said to be harder to quit than heroin.
However, it is not debatable that they are the primary causative agents in tobacco-derived cancers. [0]
[0] https://en.wikipedia.org/wiki/Tobacco-specific_nitrosamines