What is tac in weed?

"Tac" is a slang term for tetrahydrocannabinolic acid, which is the precursor to the psychoactive compound THC found in cannabis. When cannabis is heated or exposed to light, the THCA is converted into THC through a process called decarboxylation. THC is the compound responsible for the psychoactive effects of cannabis, including the feeling of being "high". THCA itself does not have psychoactive properties, but it does have some potential therapeutic benefits such as anti-inflammatory and neuroprotective properties.

Overall, the levels of THCA in cannabis can vary depending on the strain and growing conditions, but it typically ranges from 5-25% of the total cannabinoid content. Some people prefer strains with higher levels of THCA for its potential therapeutic benefits without the psychoactive effects of THC.