Every post, with its source
20 posts so far, newest first. Each one links the study, quotes it, and says where it falls short.
Is a crash 3.93× as likely at .08?
Adjusted for age and sex, crash risk vs no alcohol was 2.07× at a breath level of .05, 3.93× at .08, 5.64× at .10 and 12.18× at .15.
Lacey et al., 2016
Can a family game add 1,661 steps a day?
For the first 12, some families also played a game together: points and levels.
Patel et al., 2017
Off alcohol, can 25 of 34 brain regions thicken?
25 of 34 cortex regions grew thicker, 19 changed faster in the first month, and by 7.3 months 24 matched a group of 45 light drinkers.
Durazzo et al., 2024
Same sugar, fat and salt. Why 508 more calories?
On a mostly ultra-processed menu, people ate 508 more calories a day and gained 0.9 kg.
Hall et al., Cell Metabolism, 2019
One pack a day. What does a year cost?
At the US average of $10.15 a pack, a pack a day costs $3,704.75 a year.
Campaign for Tobacco-Free Kids, 2026
Can testosterone rise 17% after 30 years without training?
After 12 weeks of training, men around 62 who hadn't exercised in 30 years had about 17% more testosterone.
Hayes et al., Endocrine Connections, 2017
What do 3 weeks of beer do to testosterone?
After 3 weeks of beer with dinner, men's morning testosterone was 6.8% lower. Women's didn't change.
Sierksma et al., Alcoholism: Clinical and Experimental Research, 2004
Can one week of 5-hour nights lower testosterone 10–15%?
After a week of 5-hour nights, young men's daytime testosterone fell from 18.4 to 16.5 nmol/L.
Leproult & Van Cauter, JAMA, 2011
After cannabis, 68.6% felt ready to drive. Were they?
90 minutes after cannabis, 68.6% said they'd drive. Their driving hadn't improved.
Marcotte et al., JAMA Psychiatry, 2022
Can more sleep mean 270 fewer calories a day?
Short sleepers given one sleep-advice session slept 1.2 hours more and ate about 270 fewer calories a day than those who didn't.
Tasali et al., JAMA Internal Medicine, 2022
Can the brain undo what smoking built?
A week after stopping, smokers had 22% more nicotine receptors than non-smokers. By 6 to 12 weeks the gap was gone.
Cosgrove et al., Archives of General Psychiatry, 2009
Can cannabis-lowered brain receptors come back in about 4 weeks?
After about 4 weeks without cannabis, CB1 receptors were back to normal in most brain regions.
Hirvonen et al., Molecular Psychiatry, 2012
Can parents help a teen go cannabis-free?
With rewards for clean tests and a parent plan at home, 50% of teens went 10+ weeks cannabis-free, against 18%.
Stanger et al., Drug and Alcohol Dependence, 2009
Can cash help people quit smoking?
With cash for each step, 14.7% had quit smoking at 9 to 12 months, against 5.0% without.
Volpp et al., New England Journal of Medicine, 2009
What happens when a whole country's classrooms go phone-free?
Half a year after Dutch classrooms went phone-free, 75% of schools with a rule reported better focus.
Kohnstamm Instituut & Oberon, 2025
Can text messages help teens quit vaping?
A coping-skills text program left 37.8% of teens vape-free at 7 months, against 28.0%.
Graham et al., JAMA, 2024
Does Dry January last? By August: 4.3 → 3.3 days.
Eight months after Dry January, drinking days averaged 3.3 a week, down from 4.3.
University of Sussex (de Visser), 2019
Does a new habit really take 21 days?
A new daily habit took 66 days on average to feel automatic, and one missed day didn't materially change it.
Lally et al., European Journal of Social Psychology, 2010
Why is gambling harm about 1⁄3 lower here?
Where every gaming machine sits in one casino, gambling harm was about a third lower.
Russell et al., Journal of Behavioral Addictions, 2023
What happens when your phone loses the internet?
With mobile internet blocked for two weeks, daily screen time fell from 314 to 161 minutes.
Castelo et al., PNAS Nexus, 2025