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guides · substance awareness · 4 min read

Substance awareness: a GP's guide

key points

  • Australia's alcohol guideline: no more than 10 standard drinks a week, and no more than 4 on any one day.
  • Newer research finds no health benefit at any level of drinking, and cancer risk rises from the first drink with no clear safe floor. Less is better, and there is no need to drink for your health.
  • Smoking is the single biggest preventable cause of early death, and quitting works at any age. Medication plus support beats willpower alone.
  • Nicotine vaping is a second-line quitting aid, not a first choice or a long-term habit. Ask your GP or pharmacist.

This one covers three separate habits, so I have kept each section short: alcohol, smoking, and vaping. If you only read one thing, make it the box at the end.

Alcohol: what's the actual guideline?

The current Australian guideline, from the National Health and Medical Research Council (NHMRC), is this: for healthy adults, no more than 10 standard drinks a week, and no more than 4 on any single day. An Australian standard drink is 10 grams of pure alcohol, which is smaller than a standard drink in the US or UK, so numbers you read from overseas sites do not translate directly.

That guideline is designed to keep risk low, not to remove it, and the NHMRC says so itself. Newer research adds an honest layer on top: several large studies have found no cardiovascular benefit from drinking at any level, once the old comparisons are corrected for the fact that some "non-drinkers" in those studies had already stopped for health reasons. And cancer risk, particularly for mouth, throat, oesophageal and breast cancer, rises from the first drink, with no dose that has been shown to be risk-free.

So the two things sit side by side, not in conflict: the 10-and-4 guideline is what to aim under, and separately, less is better, and there is no need to drink for your health.

Smoking: it's never too late to quit

Smoking remains the single biggest preventable cause of early death, and long-term smokers lose roughly a decade of life on average. The good news is genuinely good: quitting works at any age, and the earlier you do it, the more years you get back, but even quitting later still adds meaningful time.

What actually works is medication plus behavioural support together, not either one alone and not willpower alone. That means nicotine replacement therapy, varenicline or bupropion, combined with some form of counselling or structured support. Quitline (13 78 48) is free and a good first call, and your GP can talk through which medication suits you.

Vaping: where it actually fits

Nicotine vaping is not the first thing to reach for. In Australia, the recommended first-line approach to quitting smoking is the same as above: nicotine replacement therapy, varenicline or bupropion, combined with behavioural support. Nicotine vaping has a role as a second-line option, for people who have tried first-line treatment and not succeeded, and it works best with medical guidance rather than as something you sort out on your own.

Vaping products are not risk-free. There is emerging evidence of cardiovascular signals, and the long-term picture is still being worked out. In Australia, nicotine vapes are also now a pharmacy and prescription matter rather than something freely available, so the practical step is the same one: ask your pharmacist or your GP.

Talk to your GP

None of this needs to happen all at once, and none of it needs to happen alone. Whether it's cutting back, quitting, or just working out where you actually stand, a five-minute conversation with your GP is a good place to start.

not sure where to start?

Pick whichever feels smallest: try a drink-free day or two this week, call Quitline on 13 78 48, or book a chat with your GP about a plan. Any one of those is a fine first step.

Where this comes from

All free to read in full, accessed 27 August 2026.

Dr Ahmed Al-Obaidi

Dr Ahmed Al-Obaidi · FRACGP

General information only, not personal medical advice. Talk to your own GP about what suits you.

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