But not the only reason.
Huffers do sniff Sharpie ink to get high. The ink contains alcohol and ethylene glycol monobutyl ether.
Now, I have no idea how much Sharpie ink would need to be sniffed, or how many Sharpies would be needed.
Fact: People looking for a high will try anything.
The buzz is very short lived so the user employs 'rinse and repeat'. . It also causes discoloration of the nostrils.