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I also found that you can buy (used) gauge manometers cheap on FleaBay if you shop a bit, and they are much more accurate/repeatable than water manometers at the required pressures

Towards a Vegan-Friendly Smokeless Nicotine Solution For vegans, smoking traditional cigarettes may conflict with their values due to the potential inclusion of animal byproducts, animal testing, and environmental harm associated with tobacco cultivation

In most cases, yes but always check with your airline

You can try to keep the doors and windows to your home closed, avoid burning your food, and ask people to only smoke outside but what happens if smoke still somehow makes its way indoors (which it probably will)