If you’re talking about things forbidden to Muslims, alcohol is definitely on the list. It is very apparent that consumption of it can cause bad behaviors. Tobacco does not.
This was well known in the time of the Prophet.
The fact that tobacco is harmful wasnt widely known until the 20th century. In the 1950s and 60s, it was popular to smoke and not considered harmful. Even pregnant women were not encouraged to quit.
I think it likely that if all the facts were known in the time of the Prophet, tobacco would be put on the list of fobidden things too because although its not an intoxicant, it is indeed harmful to the body.
^That is what Mamao3 said. It was not included then because of not being common in the past. You are saying what is the ruling now by current day scholars.