From the start they all grows from the ground, but there is differences, There are two most popular types of Cannabis . One is Hemp, which is non-phsycoactive have less effect to the human brain. It’s actually legal in all 50 states by now. . The other species of Cannabis is known as . This type of cannabis contains high levels of delta 9 tetrahydrocannabinol. Those have strong influence to a persons thoughts,  Delta 9 tetrahydrocannabinol is what causes the “Psychoactive” effect to take place when Cannabis is ingested. When someone inhale too much delta 9 tetrahydrocannabinol can cause some very intense hallucinogenic effects. This typically doest not  happen from just smoking  Cannabis. It’s more common while consuming concentrates or eating two fat ediles.

      According to reasrch Cannabis is a psychoactive substance. With psychoactive substances you can hallucinate or have hallucinations on them. So it could be called a hallucinogenic by some but very different from psychedelic compounds where you can have changes in perception of ego along with hallucinogenic effects.

            It is Also  depends on the quantity and from how long you are taking cannabis.

The cannabis is a hallucinogen and comes from a plant named Cannabis sativa. Its active ingredient is tetrahydrocannabinol. It is mostly found in the leaves and flowers of the plant.

Other Systems Affected

Immune System: Animal studies show that cannabis can affect the immune system, there is no evidence of this in human.

Hormones: In male heavy users of cannabis, lowered testosterone levels and sperm counts have been shown. For women, cannabis may interfere with the menstrual cycle.

Brain: Concentration and memory are affected. It is not known if long-term use of cannabis damages the brain.

So over all, there is a lot variety of reasons, first there different grass, also there people have different body tolerance,  this is not guide, so just follow your local law.