tobacco bird A is raising it's babies in a cigarette bucket at my workplace : r/mildlyinteresting Kentucky Bird Pipe Tobacco –

"Absolutely not

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If your fast is purely about calorie restriction, some may allow vaping, but its not ideal for health-focused fasts, especially if youve been avoiding food and drink for long hours

When adjusted for confounding factors such as age, endometriosis, peak oestradiol level and male factor fertility, it was found that there was a dose dependent increase in chance of pregnancy with increased LA:ALA ratios, and this was also weakly correlated with embryo implantation rates [67]

You could, but the experience may be a bit rough