Is Alcohol, Cigar and Cigarette safe?

I would like to know if there are any benefits to drinking alcohol, and smoking a cigar or cigarette? I"m quite learned, and I know our bodies need some amount of alcohol to function in some metabolic processes. I also know that we gain this required amount of alcohol from fermented foods like yoghurt so its not very necessary for us to drink in alcohol for this purpose. So my question is, what do we gain from alcohol? Its not healthy, it has numerous side effects plus leads to countless accidents yearly. Why is it legal? Why do our governments who claim to care about us so much allow us to take it in? They place bans on dangerous drugs and narcotics, why don't they do same with alcohol? Of-course, I'm aware of what happened in the U.S during 1920 to 1933( Prohibition) but what health benefits do we gain from alcohol.??? Wont even speak about Cigar's and cigarettes... Nicotine is hazardous to humans, what more explanation do we need? Plus, its addictive. The only reason I can give is it's financial benefits to the producers. I'm in Ghana, Africa and I think the only reason why marijuana isn't legal worldwide is because it profits would go to South Americans and Africans more than it would for Europeans. Because, like seriously, what benefits do we gain from cigar's and cigarettes? God help us.