F1 Tobacco Advertising in "the good old days"

[dpbird90]

So, been watching the classic F1 on the BBC website, namely the 1985 European GP at Brands, Mansells first victory. I noticed that the cars didn't have tobacco branding (McLarens had a barcode where Marlboro should be, Lotus had gold horseshoes instead of JPS, Ferrari had the red and white Marlboro logo just without the Marlboro word), yet trackside were plenty of Marlboro hoardings, and a bridge over the track had "John Player Team Lotus" written on it. Noticed it in the old British GPs as well in the 80s, any ideas?