Appletini-flavored snus at a Nikoteket store in Stockholm. A tin of 20 pouches costs around 40 Swedish kronor, or $4; a pack of cigarettes costs around 70 kronor, or $7.

Snus is a smokeless nicotine product, traditionally from Sweden, placed between the upper lip and gum line. Despite its growing use in the UK, its effects on footballers had not been formally ...