Tobacco (nicotine) is also only mildly physically addictive. The main part is psychological addiction.
Weed has also a number of negative side effects over cigarettes. THC, after all, is a psychoactive drug and some people develop a psychosis from smoking weed. This doesn't happen when smoking tobacco.
It depends entirely on what you're comparing here. Do you compare smoking 10 joints vs. 10 cigarettes or 1 joint vs 10 cigarettes (per day? per week? per month?)? If one smokes as much weed as tobacco, he might develop way worse symptoms than someone who "just" smokes cigarettes.
Weed has also a number of negative side effects over cigarettes. THC, after all, is a psychoactive drug and some people develop a psychosis from smoking weed. This doesn't happen when smoking tobacco.
It depends entirely on what you're comparing here. Do you compare smoking 10 joints vs. 10 cigarettes or 1 joint vs 10 cigarettes (per day? per week? per month?)? If one smokes as much weed as tobacco, he might develop way worse symptoms than someone who "just" smokes cigarettes.