The most common primary terpenes found in marijuana are:

1. Myrcene
2. Limonene
3. Pinene
4. Linalool
5. Caryophyllene
6. Humulene
7. Terpinene
8. Ocimene
9. Alpha-Pinene
10. Beta-Myrcene
11. Alpha-Humulene
12. Beta-Caryophyllene
13. Alpha-Bisabolol
14. Camphene
15. Beta-Pinene
16. Gamma-Terpinene
17. Delta-3-Carene
18. Eucalyptol
19. Alpha-Terpineol
20. Trans-Ocimene.

It's important to note that the presence and concentration of these terpenes can vary widely depending on the genetics of the plant, the growing conditions, and the methods used to extract and process the plant. Also, keep in mind that the above-listed terpenes are not exclusive to marijuana and can be found in other plant species as well. It's also worth noting that this list is not exhaustive and there are other primary terpenes present in marijuana but these are considered the most common and found in most strains.