Lamar Odom Worried for Bam Margera After Former 'Jackass' Star Ditched Detox

Lamar Odom is worried for Bam Margera ... worried he's keeping bad company. As we first reported ... Bam was detoxing in San Diego earlier this month with Lamar's help, but he left early, and given Bam's track record, Lamar is concerned. Lamar…