A joint is made out of pure cannabis or grass; or hashish mixed with tobacco.
Alcohol is a general term, which covers a wide variety of products:
wine, cider, beer, port, cognac, whisky, vodka are types of alcohol with various rates of alcoholic content ranging from 5 to 90 ° (active principles)
Cannabis works the same way: but when we talk about a joint of grass or hashish, there are more than 100 varieties and its T.H.C. rate (active principles) –ranges from 4% to 35% - goes unnoted.alcools aux taux variés de 5 à 90 degrés ( principes actifs)

Yes, Alcohol is a sedative drug. In drinking regularly a large amount of alcohol, one becomes an alcoholic within a few years. Alcohol is characteristically able to potentialize the effect of all other drugs it is mixed with. If one mixes alcohol with another or others drugs, one can very rapidly become a drug-addict.

Drugs are not a disease. The best way to stop them is not to take any. Heroin addicts who achieved withdraw admit that complete abstinence is the only solution. They say it themselves : it is more difficult to withdraw from Subutex (substitution drugs) than from heroin…

 When you consume alcohol and cannabis simultaneously, these products mutually increase their effects. The current practice is to use alcohol and cannabis at the same time. Many young people nowadays use this common method to try to get “stoned”.