What is the connection between alcohol or drug use and problem gambling risk?

If you're asking this because something felt off — a session that went longer than planned, bets that crept up after a few drinks — that instinct is worth paying attention to. The research on this is consistent and sobering.

Gambling, alcohol, and drug use don't just co-exist; they interact in ways that amplify risk. Drinking or using drugs while gambling can lead to increased risk-taking — playing longer, placing larger or riskier bets, and generally spending more money than intended. That's not a moral judgment, it's a straightforward neurological reality: substances impair the prefrontal decision-making that normally acts as a brake.

The broader association runs deeper than in-the-moment impairment. Frequency of alcohol use, cannabis use, and illicit drug use are all associated with problem gambling. Gambling when depressed, stressed, or anxious — combined with alcohol or cannabis use — can impair judgement and is associated with gambling harms. These aren't independent risks that simply add together; they tend to feed each other.

Why the overlap is so common

The link between gambling and substance use may stem from similar neurobiological and psychological factors underlying both conditions. Gambling disorder is classified in the DSM-5 under substance-related and addictive disorders criteria, reflecting evidence that gambling behaviours activate similar reward systems to drugs. In other words, the brain pathways involved in chasing a bet and chasing a high overlap significantly — which is part of why these conditions so often appear together.

The combination of alcohol or substance use with gambling may lead to a cycle of addictive behaviours, exacerbating the development and severity of gambling addiction. And the relationship isn't one-directional. Prospective studies indicate that in some cases gambling precedes the onset of the comorbid disorder, while in other instances the temporal relationship is reversed. Either can come first; each makes the other harder to manage.

People with a gambling problem are significantly more likely than those without problems to report gambling while high or drunk. That correlation matters practically: if you notice that your riskiest sessions tend to coincide with drinking, that pattern itself is a signal worth taking seriously.

What this means for online play in Ontario

Playing from home on a licensed Ontario platform — the kind that carries both the iGaming Ontario and BetGuard logos — removes some of the social friction that might otherwise slow you down, which makes the substance-use risk factor more relevant, not less. A casino floor has staff who can observe behaviour; a laptop at midnight after a few drinks does not. The responsible-gambling tools built into Ontario-registered sites — session limits, deposit limits, cooling-off periods — exist precisely for situations where external judgment is reduced. Using them proactively, before a session rather than during one, is the more effective approach.

Ontario's gambling support line handles both gambling and substance-use concerns together. ConnexOntario provides information on treatment services in Ontario and offers brief support for people experiencing problems with gambling, drugs, alcohol, or mental health — free, confidential, and available anytime. Reach them at 1-866-531-2600 (24/7). All of this applies to adults 19 and older, which is the legal gambling age in Ontario.