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Collider bias can arise if there are confounders of the effect of smoking on vaping (denoted intermediate confounders in the diagram), such as individual smoking histories, or parental smoking/vaping (for youth)

They had paint on their carapaces, and the lead one was larger than the rest

This physical change might put you off from consuming food during the eating window

If you smoke your first cigarette within 30 minutes of waking up, use 4 mg nicotine lozenge

Even if you can wash a pillow cover, you will have to get rid of the pillow filler unless you can launder that too

These residues can release toxic compounds over time, impacting indoor air quality