Judging Amy to Melrose Place (2009)

Morleys (The X-Files' Cancer Man's brand of cigs) are sued for causing cancer on Judging Amy

Brenda Walsh picks up a Morley smoking habit while in Paris on Beverly Hills 90210

90210 was a continuation of Beverly Hills 90210 years later

Melrose Place (2009) was a continuation of Melrose Place which was a spin off of Beverly Hills 90210 that was continued as 90210