Further, he notes that other studies have failed to connect cannabis with lung cancer, and accuses the BLF of "scaremongering over cannabis". Short-term effects
When smoked, the short-term effects of cannabis manifest within seconds and are fully apparent within a few minutes, typically lasting for 1–3 hours, varying by the person and the strain of cannabis. After oral ingestion of cannabis, the onset of effect is delayed relative to smoking, taking 30 minutes to 2 hours, but the duration is prolonged due to continued slow absorption. The duration of noticeable effects has been observed to diminish after prolonged, repeated use and the development of increased tolerance to cannabinoids. Psychological effects
The psychoactive effects of cannabis, known as a "high", are subjective and vary among persons and the method of use. When THC enters the blood stream and reaches the brain, it binds to cannabinoid receptors. The endogenous ligand of these receptors is anandamide, the effects of which THC emulates. This agonism of the cannabinoid receptors results in changes in the levels of various neurotransmitters, especially dopamine and norepinephrine; neurotransmitters which are closely associated with the acute effects of cannabis ingestion, such as euphoria and anxiety. Some effects may include a general alteration of conscious perception, euphoria, feelings of well-being, relaxation or stress reduction, increased appreciation of the arts, including humor and music (especially discerning its various components/instruments), joviality, metacognition and introspection, enhanced recollection (episodic memory), increased sensuality, increased awareness of sensation, increased libido, and creativity.
A 2012 systematic review found although it was difficult to draw firm conclusions, there was some evidence that prenatal exposure to cannabis was associated with "deficits in language, attention, areas of cognitive performance, and delinquent behavior in adolescence". A report prepared for the Australian National Council on Drugs concluded cannabis and other cannabinoids are contraindicated in pregnancy as it may interact with the endocannabinoid system. Effects in pediatrics
Children can become exposed to cannabis, typically through accidental exposure which can lead to very high doses, especially in the case of edibles. Unlike in adults, these levels of exposure can lead to major complications in children. These complications include encephalopathy, hypotension, respiratory depression severe enough to require ventilation, somnolence, coma, and there have been case reports of death. Pediatric exposure to edibles is of increasing concern because these products are typically sweets (gummies, cookies, etc. ), and their prevalence is increasing as cannabis is legalized or decriminalized in many territories. See also
Cannabis smoking
Psychoactive drug

References
Further reading
National Academies of Sciences, Engineering, and Medicine (2017). The Health Effects of Cannabis and Cannabinoids: The Current State of Evidence and Recommendations for Research. National Academies of Sciences, Engineering, and Medicine. Washington, DC: The National Academies Press. doi:10.17226/24625. ISBN 978-0-309-45304-2. PMID 28182367. {{cite book}}:  CS1 maint: multiple names: authors list (link)