Duration of effects

* The effects of ingested cannabis can sometimes take up to two to three hours to appear. It is strongly advised to start with a low dose and wait a few hours before consuming more, if desired.

** The duration of the effects, pleasant or unpleasant, may vary depending on the nature and strength of the product, the quantity consumed, the method of consumption and the tolerance of the consumer.

Intensity of effects

The higher the THC concentration in cannabis, the stronger the psychoactive and physical effects are felt by users. The same is true for undesirable side effects.

But it's not just the cannabinoid concentration that impacts the intensity and duration of the effects.  

Recent research demonstrates that the method of consumption also influences the effects experienced. The psychoactive effects of consumption involving digestion are said to be more intense and longer-lasting than those of consumption by inhalation
Furthermore, some studies claim that the higher the CBD concentration in cannabis, the fewer the undesirable effects of THC, but others question this assertion. More research is needed on this topic.  

To reduce the risk of a bad experience or "bad trip," it is advisable to consume small doses, choose products with a moderate THC concentration, and space out your use. Furthermore, it's important to understand that the types and intensity of effects will vary from person to person.