What are some harmful substances in marijuana?

There are 400 to 500 chemicals...some of the major types of chemical constituents in marijuana preparations include acids, alcohols, aldehydes, and amino acids. Cannabinoids, esters, enzymes, proteins, sugars, glycoproteins, hydrocarbons, ketones, lactones, nitrogenous compounds, phenols, pigments, steroids, terpenes, and vitamins.