What is a common method of ingestion for hallucinogens?

Hallucinogens can be ingested through various methods, making the option indicating "all of the above" the most accurate. Smoking hallucinogens allows for rapid absorption into the bloodstream, particularly with substances like DMT or certain forms of cannabis. Injection is also a method used for some hallucinogenic substances, providing immediate effects by delivering the drug directly into circulation.

Additionally, transdermal absorption is another route through which certain hallucinogens can be administered, allowing the drug to enter the bloodstream through the skin. Given that hallucinogens are versatile in their methods of ingestion, the correct response encompasses all available routes: smoking, injection, and transdermal methods. This highlights the diverse ways individuals may choose to consume these substances, each affecting the onset and intensity of the hallucinogenic effects.