Help & Guidance — Purple Haze MK
Why Does Corona Smell Like Weed?
Two things make Corona smell like cannabis. First, hops and cannabis are botanical relatives in the same plant family — they share many of the same aromatic terpene molecules. Second, Corona's iconic clear glass bottle offers almost no protection from ultraviolet light, which triggers a chemical reaction that produces an intensely skunky compound. Together these create one of the most recognisable cannabis-adjacent aromas in any beer.
Corona smells like weed for two distinct but related scientific reasons. The first is botanical: hops (Humulus lupulus) and cannabis (Cannabis sativa) both belong to the Cannabaceae plant family, sharing a common ancestor around 28 million years ago. As a result they produce many of the same aromatic oils — called terpenes — including myrcene, humulene and caryophyllene. These terpenes smell similar whether they come from hops or cannabis, because your nose cannot tell identical molecules apart by their source. The second reason is photochemical: Corona is sold in clear glass bottles, which offer virtually no UV protection. When hops-derived compounds called iso-alpha acids are exposed to ultraviolet light, they react to form a sulphurous molecule called 3-methyl-2-butene-1-thiol (3-MBT) — detectable by the human nose at concentrations as low as one part per billion — that smells intensely of skunk and cannabis. This light-strike process is why opened-shelf Coronas often smell particularly strong.
Reason One: Hops and Cannabis Are Botanical Relatives
The Cannabaceae family of flowering plants contains both Cannabis sativa — the species that includes both marijuana and hemp — and Humulus lupulus, the hop plant used to give beer its bitterness and aroma. These two plants diverged from a common ancestor approximately 28 million years ago, which in evolutionary terms is relatively recent. As a result, they still share substantial biochemical machinery for producing aromatic oils.
Both plants synthesise terpenes — volatile organic compounds that give plants their distinctive smells — through similar biological pathways. In cannabis, terpenes create the huge variety of aromas from citrus to pine to skunk. In hops, the same terpenes define the character of different beer styles. The overlap is not accidental: it is the direct product of shared evolutionary ancestry.
The Shared Terpenes That Make Corona Smell Like Cannabis
Myrcene
Found in: hops, cannabis, mangoes, thymeThe most abundant aromatic compound in hops and one of the most prominent in cannabis. Myrcene creates earthy, musky, slightly fruity notes — defined as the "green hop aroma" in brewing. When your nose catches a whiff of an open bottle of Corona and thinks "that smells like weed," myrcene is almost certainly the primary reason. It is chemically identical whether it came from a hop flower or a cannabis plant.
Humulene
Found in: hops, cannabis, cloves, sageNamed after the Latin name for hops (Humulus lupulus), humulene is the distinctive woody, herbal, slightly spicy compound that defines hop aroma in all beer styles. It occurs prominently in cannabis too — particularly in earthy and woody strains. Its presence in both plants reflects their shared Cannabaceae ancestry.
Beta-caryophyllene
Found in: hops, cannabis, black pepper, clovesA peppery, sharp terpene that appears in both hops and cannabis as well as everyday spices like black pepper and cloves. Beta-caryophyllene adds a spicy, almost stinging quality to the aroma profile. It is the terpene that drug detection dogs are typically trained to identify on cannabis — yet it is present in legally brewed beer in every supermarket.
Pinene
Found in: hops, cannabis, pine trees, rosemaryThe crisp, fresh pine-needle character found in some hops and cannabis strains. Pinene contributes to the green, resinous quality in both plants. In beer it is less dominant than myrcene and humulene but rounds out the hop aroma profile with freshness.
Reason Two: Light-Striking Through the Clear Bottle
The second reason Corona specifically — rather than all beers — smells so noticeably like cannabis is its signature clear glass bottle. This is where beer chemistry becomes truly interesting.
When beer is brewed, hop compounds called iso-alpha acids are produced. These give beer its bitterness and contribute to its aroma. When these compounds are exposed to ultraviolet light — from sunlight or shop lighting — they break down into free radicals. These free radicals react with proteins in the beer to form a molecule called 3-methyl-2-butene-1-thiol, abbreviated as 3-MBT.
3-MBT is a sulphurous thiol — the same class of compounds responsible for the smell of skunk spray. The human nose can detect 3-MBT at concentrations as low as one part per billion. The result is an intensely skunky, cannabis-like aroma that can overwhelm the original terpene character of the hops.
Brewery scientists at the University of North Carolina identified this reaction in 2001. Their research explains not just why Corona smells like cannabis but also why the brand's marketing has long included a lime wedge — believed to help mask the light-struck aroma.
How Bottle Colour Affects Light-Strike Risk
Clear glass — Corona
Virtually no UV protection. Maximum photodegradation of iso-alpha acids. The iconic clear bottle showcases the golden lager but creates maximum skunking risk. Most noticeable on bottles stored in sunlit windows or open-fronted displays.
Green glass — Heineken, Peroni
Green glass filters some UV but not enough to prevent light-striking entirely over longer exposure times. Green-bottled beers also skunk but less severely than clear bottles in the same light conditions.
Brown glass — most real ales
Brown glass absorbs a significantly higher proportion of UV radiation, giving substantially better protection from light-striking. Most traditional UK ales and German lagers use brown bottles specifically for this reason.
Aluminium can
Cans completely block all UV light. Beer in cans never light-strikes. The absence of skunking is one reason craft beer drinkers and quality-focused brewers increasingly prefer cans despite the traditional prestige of bottled beer.
Hops and cannabis both belong to Cannabaceae — they share a common ancestor from around 28 million years ago and produce many of the same aromatic terpene compounds as a result
The threshold at which the human nose can detect 3-MBT — the sulphurous skunking molecule produced when UV light hits hop compounds in a clear bottle
All beers contain cannabis-related terpenes from hops — but Corona's clear glass maximises UV exposure and skunking, making it one of the most noticeably weed-adjacent beers
Corona contains no cannabis and no cannabinoids. The cannabis-like smell is entirely the product of shared botanical chemistry between hops and cannabis, and the additional skunking effect caused by UV exposure through the clear bottle. The terpene molecules in your Corona are chemically identical to those in cannabis — your nose cannot distinguish them by source. There is no THC, CBD or any other cannabinoid in beer of any kind. The smell is a coincidence of plant evolution and packaging choice, not an indication of cannabis content.
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This article is part of the Purple Haze MK Help and Guidance Centre. For more cannabis and CBD guidance, visit the Purple Haze MK Help and Guidance Centre.
Frequently Asked Questions
Does Corona contain cannabis?
No. Corona is a standard lager brewed from water, barley malt, hops, yeast and maize. It contains no cannabis, no THC and no CBD of any kind. The cannabis-like smell comes entirely from terpenes naturally present in hops — which are botanical relatives of cannabis — and from light-induced chemical reactions in the clear glass bottle. There is no cannabis in the recipe or the production process.
Why does cold Corona smell more like weed?
Temperature affects how strongly terpenes vaporise and reach your nose. Cold beer releases volatile terpene compounds more slowly — so opening a very cold Corona produces a concentrated burst of terpene aroma as the temperature rises and the terpenes rapidly volatilise. The cold also suppresses the CO2 carrying other aromas, making the terpene character relatively more prominent. Combined with any pre-existing light-strike, this creates the distinctive strong weed-adjacent aroma of a freshly opened cold Corona.
Do all beers smell like weed or just Corona?
All beers brewed with hops contain the same terpenes that create the cannabis connection — myrcene, humulene, caryophyllene and others. Hop-forward beers such as IPAs often have a much more pronounced cannabis-adjacent aroma than lagers like Corona. However Corona is particularly noticeable because its clear glass bottle maximises light-striking. IPAs in brown bottles may smell strongly of cannabis-related terpenes without the sulphurous skunking effect that Corona's packaging adds.
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